| 0,0 → 1,257 |
|---|
| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2005 Brian Paul All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: |
| * Keith Whitwell <keith@tungstengraphics.com> |
| */ |
| |
| |
| #include "main/api_arrayelt.h" |
| #include "main/glheader.h" |
| #include "main/mtypes.h" |
| #include "main/vtxfmt.h" |
| #include "vbo_context.h" |
| |
| |
| |
| void vbo_exec_init( struct gl_context *ctx ) |
| { |
| struct vbo_exec_context *exec = &vbo_context(ctx)->exec; |
| |
| exec->ctx = ctx; |
| |
| /* Initialize the arrayelt helper |
| */ |
| if (!ctx->aelt_context && |
| !_ae_create_context( ctx )) |
| return; |
| |
| vbo_exec_vtx_init( exec ); |
| |
| ctx->Driver.NeedFlush = 0; |
| ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END; |
| ctx->Driver.BeginVertices = vbo_exec_BeginVertices; |
| ctx->Driver.FlushVertices = vbo_exec_FlushVertices; |
| |
| vbo_exec_invalidate_state( ctx, ~0 ); |
| } |
| |
| |
| void vbo_exec_destroy( struct gl_context *ctx ) |
| { |
| struct vbo_exec_context *exec = &vbo_context(ctx)->exec; |
| |
| if (ctx->aelt_context) { |
| _ae_destroy_context( ctx ); |
| ctx->aelt_context = NULL; |
| } |
| |
| vbo_exec_vtx_destroy( exec ); |
| } |
| |
| |
| /** |
| * Really want to install these callbacks to a central facility to be |
| * invoked according to the state flags. That will have to wait for a |
| * mesa rework: |
| */ |
| void vbo_exec_invalidate_state( struct gl_context *ctx, GLuint new_state ) |
| { |
| struct vbo_context *vbo = vbo_context(ctx); |
| struct vbo_exec_context *exec = &vbo->exec; |
| |
| if (!exec->validating && new_state & (_NEW_PROGRAM|_NEW_ARRAY)) { |
| exec->array.recalculate_inputs = GL_TRUE; |
| |
| /* If we ended up here because a VAO was deleted, the _DrawArrays |
| * pointer which pointed to the VAO might be invalid now, so set it |
| * to NULL. This prevents crashes in driver functions like Clear |
| * where driver state validation might occur, but the vbo module is |
| * still in an invalid state. |
| * |
| * Drivers should skip vertex array state validation if _DrawArrays |
| * is NULL. It also has no effect on performance, because attrib |
| * bindings will be recalculated anyway. |
| */ |
| if (vbo->last_draw_method == DRAW_ARRAYS) { |
| ctx->Array._DrawArrays = NULL; |
| vbo->last_draw_method = DRAW_NONE; |
| } |
| } |
| |
| if (new_state & _NEW_EVAL) |
| exec->eval.recalculate_maps = 1; |
| |
| _ae_invalidate_state(ctx, new_state); |
| } |
| |
| |
| /** |
| * Figure out the number of transform feedback primitives that will be output |
| * considering the drawing mode, number of vertices, and instance count, |
| * assuming that no geometry shading is done and primitive restart is not |
| * used. |
| * |
| * This is used by driver back-ends in implementing the PRIMITIVES_GENERATED |
| * and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries. It is also used to |
| * pre-validate draw calls in GLES3 (where draw calls only succeed if there is |
| * enough room in the transform feedback buffer for the result). |
| */ |
| size_t |
| vbo_count_tessellated_primitives(GLenum mode, GLuint count, |
| GLuint num_instances) |
| { |
| size_t num_primitives; |
| switch (mode) { |
| case GL_POINTS: |
| num_primitives = count; |
| break; |
| case GL_LINE_STRIP: |
| num_primitives = count >= 2 ? count - 1 : 0; |
| break; |
| case GL_LINE_LOOP: |
| num_primitives = count >= 2 ? count : 0; |
| break; |
| case GL_LINES: |
| num_primitives = count / 2; |
| break; |
| case GL_TRIANGLE_STRIP: |
| case GL_TRIANGLE_FAN: |
| case GL_POLYGON: |
| num_primitives = count >= 3 ? count - 2 : 0; |
| break; |
| case GL_TRIANGLES: |
| num_primitives = count / 3; |
| break; |
| case GL_QUAD_STRIP: |
| num_primitives = count >= 4 ? ((count / 2) - 1) * 2 : 0; |
| break; |
| case GL_QUADS: |
| num_primitives = (count / 4) * 2; |
| break; |
| default: |
| assert(!"Unexpected primitive type in count_tessellated_primitives"); |
| num_primitives = 0; |
| break; |
| } |
| return num_primitives * num_instances; |
| } |
| |
| |
| |
| /** |
| * In some degenarate cases we can improve our ability to merge |
| * consecutive primitives. For example: |
| * glBegin(GL_LINE_STRIP); |
| * glVertex(1); |
| * glVertex(1); |
| * glEnd(); |
| * glBegin(GL_LINE_STRIP); |
| * glVertex(1); |
| * glVertex(1); |
| * glEnd(); |
| * Can be merged as a GL_LINES prim with four vertices. |
| * |
| * This function converts 2-vertex line strips/loops into GL_LINES, etc. |
| */ |
| void |
| vbo_try_prim_conversion(struct _mesa_prim *p) |
| { |
| if (p->mode == GL_LINE_STRIP && p->count == 2) { |
| /* convert 2-vertex line strip to a separate line */ |
| p->mode = GL_LINES; |
| } |
| else if ((p->mode == GL_TRIANGLE_STRIP || p->mode == GL_TRIANGLE_FAN) |
| && p->count == 3) { |
| /* convert 3-vertex tri strip or fan to a separate triangle */ |
| p->mode = GL_TRIANGLES; |
| } |
| |
| /* Note: we can't convert a 4-vertex quad strip to a separate quad |
| * because the vertex ordering is different. We'd have to muck |
| * around in the vertex data to make it work. |
| */ |
| } |
| |
| |
| /** |
| * Helper function for determining if two subsequent glBegin/glEnd |
| * primitives can be combined. This is only possible for GL_POINTS, |
| * GL_LINES, GL_TRIANGLES and GL_QUADS. |
| * If we return true, it means that we can concatenate p1 onto p0 (and |
| * discard p1). |
| */ |
| bool |
| vbo_can_merge_prims(const struct _mesa_prim *p0, const struct _mesa_prim *p1) |
| { |
| if (!p0->begin || |
| !p1->begin || |
| !p0->end || |
| !p1->end) |
| return false; |
| |
| /* The prim mode must match (ex: both GL_TRIANGLES) */ |
| if (p0->mode != p1->mode) |
| return false; |
| |
| /* p1's vertices must come right after p0 */ |
| if (p0->start + p0->count != p1->start) |
| return false; |
| |
| if (p0->basevertex != p1->basevertex || |
| p0->num_instances != p1->num_instances || |
| p0->base_instance != p1->base_instance) |
| return false; |
| |
| /* can always merge subsequent GL_POINTS primitives */ |
| if (p0->mode == GL_POINTS) |
| return true; |
| |
| /* independent lines with no extra vertices */ |
| if (p0->mode == GL_LINES && p0->count % 2 == 0 && p1->count % 2 == 0) |
| return true; |
| |
| /* independent tris */ |
| if (p0->mode == GL_TRIANGLES && p0->count % 3 == 0 && p1->count % 3 == 0) |
| return true; |
| |
| /* independent quads */ |
| if (p0->mode == GL_QUADS && p0->count % 4 == 0 && p1->count % 4 == 0) |
| return true; |
| |
| return false; |
| } |
| |
| |
| /** |
| * If we've determined that p0 and p1 can be merged, this function |
| * concatenates p1 onto p0. |
| */ |
| void |
| vbo_merge_prims(struct _mesa_prim *p0, const struct _mesa_prim *p1) |
| { |
| assert(vbo_can_merge_prims(p0, p1)); |
| |
| p0->count += p1->count; |
| p0->end = p1->end; |
| } |