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1901 | serge | 1 | /* |
2 | * Mesa 3-D graphics library |
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3 | * Version: 7.1 |
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4 | * |
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5 | * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. |
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6 | * |
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7 | * Permission is hereby granted, free of charge, to any person obtaining a |
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8 | * copy of this software and associated documentation files (the "Software"), |
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9 | * to deal in the Software without restriction, including without limitation |
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10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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11 | * and/or sell copies of the Software, and to permit persons to whom the |
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12 | * Software is furnished to do so, subject to the following conditions: |
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13 | * |
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14 | * The above copyright notice and this permission notice shall be included |
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15 | * in all copies or substantial portions of the Software. |
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16 | * |
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17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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18 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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20 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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21 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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22 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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23 | */ |
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24 | |||
25 | #include "glheader.h" |
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26 | #include "api_validate.h" |
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27 | #include "bufferobj.h" |
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28 | #include "context.h" |
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29 | #include "imports.h" |
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30 | #include "mfeatures.h" |
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31 | #include "mtypes.h" |
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32 | #include "vbo/vbo.h" |
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33 | |||
34 | |||
35 | /** |
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36 | * \return number of bytes in array [count] of type. |
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37 | */ |
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38 | static GLsizei |
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39 | index_bytes(GLenum type, GLsizei count) |
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40 | { |
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41 | if (type == GL_UNSIGNED_INT) { |
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42 | return count * sizeof(GLuint); |
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43 | } |
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44 | else if (type == GL_UNSIGNED_BYTE) { |
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45 | return count * sizeof(GLubyte); |
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46 | } |
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47 | else { |
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48 | ASSERT(type == GL_UNSIGNED_SHORT); |
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49 | return count * sizeof(GLushort); |
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50 | } |
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51 | } |
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52 | |||
53 | |||
54 | /** |
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55 | * Find the max index in the given element/index buffer |
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56 | */ |
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57 | GLuint |
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58 | _mesa_max_buffer_index(struct gl_context *ctx, GLuint count, GLenum type, |
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59 | const void *indices, |
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60 | struct gl_buffer_object *elementBuf) |
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61 | { |
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62 | const GLubyte *map = NULL; |
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63 | GLuint max = 0; |
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64 | GLuint i; |
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65 | |||
66 | if (_mesa_is_bufferobj(elementBuf)) { |
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67 | /* elements are in a user-defined buffer object. need to map it */ |
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68 | map = ctx->Driver.MapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER, |
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69 | GL_READ_ONLY, elementBuf); |
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70 | /* Actual address is the sum of pointers */ |
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71 | indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices); |
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72 | } |
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73 | |||
74 | if (type == GL_UNSIGNED_INT) { |
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75 | for (i = 0; i < count; i++) |
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76 | if (((GLuint *) indices)[i] > max) |
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77 | max = ((GLuint *) indices)[i]; |
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78 | } |
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79 | else if (type == GL_UNSIGNED_SHORT) { |
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80 | for (i = 0; i < count; i++) |
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81 | if (((GLushort *) indices)[i] > max) |
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82 | max = ((GLushort *) indices)[i]; |
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83 | } |
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84 | else { |
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85 | ASSERT(type == GL_UNSIGNED_BYTE); |
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86 | for (i = 0; i < count; i++) |
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87 | if (((GLubyte *) indices)[i] > max) |
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88 | max = ((GLubyte *) indices)[i]; |
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89 | } |
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90 | |||
91 | if (map) { |
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92 | ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, elementBuf); |
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93 | } |
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94 | |||
95 | return max; |
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96 | } |
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97 | |||
98 | |||
99 | /** |
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100 | * Check if OK to draw arrays/elements. |
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101 | */ |
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102 | static GLboolean |
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103 | check_valid_to_render(struct gl_context *ctx, const char *function) |
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104 | { |
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105 | if (!_mesa_valid_to_render(ctx, function)) { |
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106 | return GL_FALSE; |
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107 | } |
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108 | |||
109 | switch (ctx->API) { |
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110 | #if FEATURE_es2_glsl |
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111 | case API_OPENGLES2: |
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112 | /* For ES2, we can draw if any vertex array is enabled (and we |
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113 | * should always have a vertex program/shader). */ |
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114 | if (ctx->Array.ArrayObj->_Enabled == 0x0 || !ctx->VertexProgram._Current) |
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115 | return GL_FALSE; |
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116 | break; |
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117 | #endif |
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118 | |||
119 | #if FEATURE_ES1 || FEATURE_GL |
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120 | case API_OPENGLES: |
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121 | case API_OPENGL: |
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122 | /* For regular OpenGL, only draw if we have vertex positions |
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123 | * (regardless of whether or not we have a vertex program/shader). */ |
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124 | if (!ctx->Array.ArrayObj->Vertex.Enabled && |
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125 | !ctx->Array.ArrayObj->VertexAttrib[0].Enabled) |
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126 | return GL_FALSE; |
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127 | break; |
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128 | #endif |
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129 | |||
130 | default: |
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131 | ASSERT_NO_FEATURE(); |
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132 | } |
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133 | |||
134 | return GL_TRUE; |
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135 | } |
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136 | |||
137 | |||
138 | /** |
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139 | * Do bounds checking on array element indexes. Check that the vertices |
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140 | * pointed to by the indices don't lie outside buffer object bounds. |
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141 | * \return GL_TRUE if OK, GL_FALSE if any indexed vertex goes is out of bounds |
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142 | */ |
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143 | static GLboolean |
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144 | check_index_bounds(struct gl_context *ctx, GLsizei count, GLenum type, |
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145 | const GLvoid *indices, GLint basevertex) |
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146 | { |
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147 | struct _mesa_prim prim; |
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148 | struct _mesa_index_buffer ib; |
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149 | GLuint min, max; |
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150 | |||
151 | /* Only the X Server needs to do this -- otherwise, accessing outside |
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152 | * array/BO bounds allows application termination. |
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153 | */ |
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154 | if (!ctx->Const.CheckArrayBounds) |
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155 | return GL_TRUE; |
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156 | |||
157 | memset(&prim, 0, sizeof(prim)); |
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158 | prim.count = count; |
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159 | |||
160 | memset(&ib, 0, sizeof(ib)); |
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161 | ib.type = type; |
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162 | ib.ptr = indices; |
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163 | ib.obj = ctx->Array.ElementArrayBufferObj; |
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164 | |||
165 | vbo_get_minmax_index(ctx, &prim, &ib, &min, &max); |
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166 | |||
167 | if ((int)(min + basevertex) < 0 || |
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168 | max + basevertex > ctx->Array.ArrayObj->_MaxElement) { |
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169 | /* the max element is out of bounds of one or more enabled arrays */ |
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170 | _mesa_warning(ctx, "glDrawElements() index=%u is out of bounds (max=%u)", |
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171 | max, ctx->Array.ArrayObj->_MaxElement); |
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172 | return GL_FALSE; |
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173 | } |
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174 | |||
175 | return GL_TRUE; |
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176 | } |
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177 | |||
178 | |||
179 | /** |
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180 | * Error checking for glDrawElements(). Includes parameter checking |
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181 | * and VBO bounds checking. |
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182 | * \return GL_TRUE if OK to render, GL_FALSE if error found |
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183 | */ |
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184 | GLboolean |
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185 | _mesa_validate_DrawElements(struct gl_context *ctx, |
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186 | GLenum mode, GLsizei count, GLenum type, |
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187 | const GLvoid *indices, GLint basevertex) |
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188 | { |
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189 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
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190 | |||
191 | if (count <= 0) { |
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192 | if (count < 0) |
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193 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" ); |
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194 | return GL_FALSE; |
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195 | } |
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196 | |||
197 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
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198 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" ); |
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199 | return GL_FALSE; |
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200 | } |
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201 | |||
202 | if (type != GL_UNSIGNED_INT && |
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203 | type != GL_UNSIGNED_BYTE && |
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204 | type != GL_UNSIGNED_SHORT) |
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205 | { |
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206 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" ); |
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207 | return GL_FALSE; |
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208 | } |
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209 | |||
210 | if (!check_valid_to_render(ctx, "glDrawElements")) |
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211 | return GL_FALSE; |
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212 | |||
213 | /* Vertex buffer object tests */ |
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214 | if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) { |
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215 | /* use indices in the buffer object */ |
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216 | /* make sure count doesn't go outside buffer bounds */ |
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217 | if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) { |
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218 | _mesa_warning(ctx, "glDrawElements index out of buffer bounds"); |
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219 | return GL_FALSE; |
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220 | } |
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221 | } |
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222 | else { |
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223 | /* not using a VBO */ |
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224 | if (!indices) |
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225 | return GL_FALSE; |
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226 | } |
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227 | |||
228 | if (!check_index_bounds(ctx, count, type, indices, basevertex)) |
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229 | return GL_FALSE; |
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230 | |||
231 | return GL_TRUE; |
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232 | } |
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233 | |||
234 | |||
235 | /** |
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236 | * Error checking for glDrawRangeElements(). Includes parameter checking |
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237 | * and VBO bounds checking. |
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238 | * \return GL_TRUE if OK to render, GL_FALSE if error found |
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239 | */ |
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240 | GLboolean |
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241 | _mesa_validate_DrawRangeElements(struct gl_context *ctx, GLenum mode, |
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242 | GLuint start, GLuint end, |
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243 | GLsizei count, GLenum type, |
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244 | const GLvoid *indices, GLint basevertex) |
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245 | { |
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246 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
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247 | |||
248 | if (count <= 0) { |
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249 | if (count < 0) |
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250 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" ); |
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251 | return GL_FALSE; |
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252 | } |
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253 | |||
254 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
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255 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" ); |
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256 | return GL_FALSE; |
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257 | } |
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258 | |||
259 | if (end < start) { |
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260 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end |
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261 | return GL_FALSE; |
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262 | } |
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263 | |||
264 | if (type != GL_UNSIGNED_INT && |
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265 | type != GL_UNSIGNED_BYTE && |
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266 | type != GL_UNSIGNED_SHORT) { |
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267 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" ); |
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268 | return GL_FALSE; |
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269 | } |
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270 | |||
271 | if (!check_valid_to_render(ctx, "glDrawRangeElements")) |
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272 | return GL_FALSE; |
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273 | |||
274 | /* Vertex buffer object tests */ |
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275 | if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) { |
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276 | /* use indices in the buffer object */ |
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277 | /* make sure count doesn't go outside buffer bounds */ |
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278 | if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) { |
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279 | _mesa_warning(ctx, "glDrawRangeElements index out of buffer bounds"); |
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280 | return GL_FALSE; |
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281 | } |
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282 | } |
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283 | else { |
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284 | /* not using a VBO */ |
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285 | if (!indices) |
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286 | return GL_FALSE; |
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287 | } |
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288 | |||
289 | if (!check_index_bounds(ctx, count, type, indices, basevertex)) |
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290 | return GL_FALSE; |
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291 | |||
292 | return GL_TRUE; |
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293 | } |
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294 | |||
295 | |||
296 | /** |
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297 | * Called from the tnl module to error check the function parameters and |
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298 | * verify that we really can draw something. |
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299 | * \return GL_TRUE if OK to render, GL_FALSE if error found |
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300 | */ |
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301 | GLboolean |
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302 | _mesa_validate_DrawArrays(struct gl_context *ctx, |
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303 | GLenum mode, GLint start, GLsizei count) |
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304 | { |
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305 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
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306 | |||
307 | if (count <= 0) { |
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308 | if (count < 0) |
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309 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" ); |
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310 | return GL_FALSE; |
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311 | } |
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312 | |||
313 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
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314 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" ); |
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315 | return GL_FALSE; |
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316 | } |
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317 | |||
318 | if (!check_valid_to_render(ctx, "glDrawArrays")) |
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319 | return GL_FALSE; |
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320 | |||
321 | if (ctx->Const.CheckArrayBounds) { |
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322 | if (start + count > (GLint) ctx->Array.ArrayObj->_MaxElement) |
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323 | return GL_FALSE; |
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324 | } |
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325 | |||
326 | return GL_TRUE; |
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327 | } |
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328 | |||
329 | |||
330 | GLboolean |
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331 | _mesa_validate_DrawArraysInstanced(struct gl_context *ctx, GLenum mode, GLint first, |
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332 | GLsizei count, GLsizei primcount) |
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333 | { |
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334 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
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335 | |||
336 | if (count <= 0) { |
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337 | if (count < 0) |
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338 | _mesa_error(ctx, GL_INVALID_VALUE, |
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339 | "glDrawArraysInstanced(count=%d)", count); |
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340 | return GL_FALSE; |
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341 | } |
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342 | |||
343 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
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344 | _mesa_error(ctx, GL_INVALID_ENUM, |
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345 | "glDrawArraysInstanced(mode=0x%x)", mode); |
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346 | return GL_FALSE; |
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347 | } |
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348 | |||
349 | if (primcount <= 0) { |
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350 | if (primcount < 0) |
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351 | _mesa_error(ctx, GL_INVALID_VALUE, |
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352 | "glDrawArraysInstanced(primcount=%d)", primcount); |
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353 | return GL_FALSE; |
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354 | } |
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355 | |||
356 | if (!check_valid_to_render(ctx, "glDrawArraysInstanced(invalid to render)")) |
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357 | return GL_FALSE; |
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358 | |||
359 | if (ctx->CompileFlag) { |
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360 | _mesa_error(ctx, GL_INVALID_OPERATION, |
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361 | "glDrawArraysInstanced(display list"); |
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362 | return GL_FALSE; |
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363 | } |
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364 | |||
365 | if (ctx->Const.CheckArrayBounds) { |
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366 | if (first + count > (GLint) ctx->Array.ArrayObj->_MaxElement) |
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367 | return GL_FALSE; |
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368 | } |
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369 | |||
370 | return GL_TRUE; |
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371 | } |
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372 | |||
373 | |||
374 | GLboolean |
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375 | _mesa_validate_DrawElementsInstanced(struct gl_context *ctx, |
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376 | GLenum mode, GLsizei count, GLenum type, |
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377 | const GLvoid *indices, GLsizei primcount) |
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378 | { |
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379 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
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380 | |||
381 | if (count <= 0) { |
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382 | if (count < 0) |
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383 | _mesa_error(ctx, GL_INVALID_VALUE, |
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384 | "glDrawElementsInstanced(count=%d)", count); |
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385 | return GL_FALSE; |
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386 | } |
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387 | |||
388 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
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389 | _mesa_error(ctx, GL_INVALID_ENUM, |
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390 | "glDrawElementsInstanced(mode = 0x%x)", mode); |
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391 | return GL_FALSE; |
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392 | } |
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393 | |||
394 | if (type != GL_UNSIGNED_INT && |
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395 | type != GL_UNSIGNED_BYTE && |
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396 | type != GL_UNSIGNED_SHORT) { |
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397 | _mesa_error(ctx, GL_INVALID_ENUM, |
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398 | "glDrawElementsInstanced(type=0x%x)", type); |
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399 | return GL_FALSE; |
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400 | } |
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401 | |||
402 | if (primcount <= 0) { |
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403 | if (primcount < 0) |
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404 | _mesa_error(ctx, GL_INVALID_VALUE, |
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405 | "glDrawElementsInstanced(primcount=%d)", primcount); |
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406 | return GL_FALSE; |
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407 | } |
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408 | |||
409 | if (!check_valid_to_render(ctx, "glDrawElementsInstanced")) |
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410 | return GL_FALSE; |
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411 | |||
412 | /* Vertex buffer object tests */ |
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413 | if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) { |
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414 | /* use indices in the buffer object */ |
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415 | /* make sure count doesn't go outside buffer bounds */ |
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416 | if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) { |
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417 | _mesa_warning(ctx, |
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418 | "glDrawElementsInstanced index out of buffer bounds"); |
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419 | return GL_FALSE; |
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420 | } |
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421 | } |
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422 | else { |
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423 | /* not using a VBO */ |
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424 | if (!indices) |
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425 | return GL_FALSE; |
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426 | } |
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427 | |||
428 | if (!check_index_bounds(ctx, count, type, indices, 0)) |
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429 | return GL_FALSE; |
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430 | |||
431 | return GL_TRUE; |
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432 | }>=>>=>>=>>=>>=> |