/* * Copyright 2009 Corbin Simpson * * 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 * on the rights to use, copy, modify, merge, publish, distribute, sub * license, 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 (including the next * paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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. */ /* r300_render: Vertex and index buffer primitive emission. Contains both * HW TCL fastpath rendering, and SW TCL Draw-assisted rendering. */ #include "draw/draw_context.h" #include "draw/draw_vbuf.h" #include "util/u_inlines.h" #include "util/u_format.h" #include "util/u_memory.h" #include "util/u_upload_mgr.h" #include "util/u_prim.h" #include "r300_cs.h" #include "r300_context.h" #include "r300_screen_buffer.h" #include "r300_emit.h" #include "r300_reg.h" #include "r300_render.h" #include "r300_state_derived.h" /* r300_render: Vertex and index buffer primitive emission. */ #define R300_MAX_VBO_SIZE (1024 * 1024) /* XXX The DRM rejects VAP_ALT_NUM_VERTICES.. */ //#define ENABLE_ALT_NUM_VERTS uint32_t r300_translate_primitive(unsigned prim) { switch (prim) { case PIPE_PRIM_POINTS: return R300_VAP_VF_CNTL__PRIM_POINTS; case PIPE_PRIM_LINES: return R300_VAP_VF_CNTL__PRIM_LINES; case PIPE_PRIM_LINE_LOOP: return R300_VAP_VF_CNTL__PRIM_LINE_LOOP; case PIPE_PRIM_LINE_STRIP: return R300_VAP_VF_CNTL__PRIM_LINE_STRIP; case PIPE_PRIM_TRIANGLES: return R300_VAP_VF_CNTL__PRIM_TRIANGLES; case PIPE_PRIM_TRIANGLE_STRIP: return R300_VAP_VF_CNTL__PRIM_TRIANGLE_STRIP; case PIPE_PRIM_TRIANGLE_FAN: return R300_VAP_VF_CNTL__PRIM_TRIANGLE_FAN; case PIPE_PRIM_QUADS: return R300_VAP_VF_CNTL__PRIM_QUADS; case PIPE_PRIM_QUAD_STRIP: return R300_VAP_VF_CNTL__PRIM_QUAD_STRIP; case PIPE_PRIM_POLYGON: return R300_VAP_VF_CNTL__PRIM_POLYGON; default: return 0; } } static uint32_t r300_provoking_vertex_fixes(struct r300_context *r300, unsigned mode) { struct r300_rs_state* rs = (struct r300_rs_state*)r300->rs_state.state; uint32_t color_control = rs->color_control; /* By default (see r300_state.c:r300_create_rs_state) color_control is * initialized to provoking the first vertex. * * Triangle fans must be reduced to the second vertex, not the first, in * Gallium flatshade-first mode, as per the GL spec. * (http://www.opengl.org/registry/specs/ARB/provoking_vertex.txt) * * Quads never provoke correctly in flatshade-first mode. The first * vertex is never considered as provoking, so only the second, third, * and fourth vertices can be selected, and both "third" and "last" modes * select the fourth vertex. This is probably due to D3D lacking quads. * * Similarly, polygons reduce to the first, not the last, vertex, when in * "last" mode, and all other modes start from the second vertex. * * ~ C. */ if (rs->rs.flatshade_first) { switch (mode) { case PIPE_PRIM_TRIANGLE_FAN: color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_SECOND; break; case PIPE_PRIM_QUADS: case PIPE_PRIM_QUAD_STRIP: case PIPE_PRIM_POLYGON: color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_LAST; break; default: color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_FIRST; break; } } else { color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_LAST; } return color_control; } static boolean immd_is_good_idea(struct r300_context *r300, unsigned count) { return count <= 4; } static void r300_emit_draw_arrays_immediate(struct r300_context *r300, unsigned mode, unsigned start, unsigned count) { struct pipe_vertex_element* velem; struct pipe_vertex_buffer* vbuf; unsigned vertex_element_count = r300->vertex_element_count; unsigned i, v, vbi, dw, elem_offset; /* Size of the vertex, in dwords. */ unsigned vertex_size = 0; /* Offsets of the attribute, in dwords, from the start of the vertex. */ unsigned offset[PIPE_MAX_ATTRIBS]; /* Size of the vertex element, in dwords. */ unsigned size[PIPE_MAX_ATTRIBS]; /* Stride to the same attrib in the next vertex in the vertex buffer, * in dwords. */ unsigned stride[PIPE_MAX_ATTRIBS] = {0}; /* Mapped vertex buffers. */ uint32_t* map[PIPE_MAX_ATTRIBS] = {0}; CS_LOCALS(r300); /* Calculate the vertex size, offsets, strides etc. and map the buffers. */ for (i = 0; i < vertex_element_count; i++) { velem = &r300->vertex_element[i]; offset[i] = velem->src_offset / 4; size[i] = util_format_get_blocksize(velem->src_format) / 4; vertex_size += size[i]; vbi = velem->vertex_buffer_index; /* Map the buffer. */ if (!map[vbi]) { vbuf = &r300->vertex_buffer[vbi]; map[vbi] = (uint32_t*)pipe_buffer_map(r300->context.screen, vbuf->buffer, PIPE_BUFFER_USAGE_CPU_READ); map[vbi] += vbuf->buffer_offset / 4; stride[vbi] = vbuf->stride / 4; } } r300_emit_dirty_state(r300); BEGIN_CS(10 + count * vertex_size); OUT_CS_REG(R300_GA_COLOR_CONTROL, r300_provoking_vertex_fixes(r300, mode)); OUT_CS_REG(R300_VAP_VTX_SIZE, vertex_size); OUT_CS_REG(R300_VAP_VF_MIN_VTX_INDX, 0); OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, count - 1); OUT_CS_PKT3(R300_PACKET3_3D_DRAW_IMMD_2, count * vertex_size); OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_EMBEDDED | (count << 16) | r300_translate_primitive(mode)); /* Emit vertices. */ for (v = 0; v < count; v++) { for (i = 0; i < vertex_element_count; i++) { velem = &r300->vertex_element[i]; vbi = velem->vertex_buffer_index; elem_offset = offset[i] + stride[vbi] * (v + start); for (dw = 0; dw < size[i]; dw++) { OUT_CS(map[vbi][elem_offset + dw]); } } } END_CS; /* Unmap buffers. */ for (i = 0; i < vertex_element_count; i++) { vbi = r300->vertex_element[i].vertex_buffer_index; if (map[vbi]) { vbuf = &r300->vertex_buffer[vbi]; pipe_buffer_unmap(r300->context.screen, vbuf->buffer); map[vbi] = NULL; } } } static void r300_emit_draw_arrays(struct r300_context *r300, unsigned mode, unsigned count) { #if defined(ENABLE_ALT_NUM_VERTS) boolean alt_num_verts = count > 65535; #else boolean alt_num_verts = FALSE; #endif CS_LOCALS(r300); if (alt_num_verts) { assert(count < (1 << 24)); BEGIN_CS(10); OUT_CS_REG(R500_VAP_ALT_NUM_VERTICES, count); } else { BEGIN_CS(8); } OUT_CS_REG(R300_GA_COLOR_CONTROL, r300_provoking_vertex_fixes(r300, mode)); OUT_CS_REG(R300_VAP_VF_MIN_VTX_INDX, 0); OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, count - 1); OUT_CS_PKT3(R300_PACKET3_3D_DRAW_VBUF_2, 0); OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_LIST | (count << 16) | r300_translate_primitive(mode) | (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0)); END_CS; } static void r300_emit_draw_elements(struct r300_context *r300, struct pipe_buffer* indexBuffer, unsigned indexSize, unsigned minIndex, unsigned maxIndex, unsigned mode, unsigned start, unsigned count) { uint32_t count_dwords; uint32_t offset_dwords = indexSize * start / sizeof(uint32_t); #if defined(ENABLE_ALT_NUM_VERTS) boolean alt_num_verts = count > 65535; #else boolean alt_num_verts = FALSE; #endif CS_LOCALS(r300); assert((start * indexSize) % 4 == 0); /* XXX Non-zero offset locks up. */ if (offset_dwords != 0) { return; } if (alt_num_verts) { assert(count < (1 << 24)); BEGIN_CS(16); OUT_CS_REG(R500_VAP_ALT_NUM_VERTICES, count); } else { BEGIN_CS(14); } OUT_CS_REG(R300_GA_COLOR_CONTROL, r300_provoking_vertex_fixes(r300, mode)); OUT_CS_REG(R300_VAP_VF_MIN_VTX_INDX, minIndex); OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, maxIndex); OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, 0); if (indexSize == 4) { count_dwords = count + start; OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) | R300_VAP_VF_CNTL__INDEX_SIZE_32bit | r300_translate_primitive(mode) | (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0)); } else { count_dwords = (count + start + 1) / 2; OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) | r300_translate_primitive(mode) | (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0)); } /* INDX_BUFFER is a truly special packet3. * Unlike most other packet3, where the offset is after the count, * the order is reversed, so the relocation ends up carrying the * size of the indexbuf instead of the offset. */ OUT_CS_PKT3(R300_PACKET3_INDX_BUFFER, 2); OUT_CS(R300_INDX_BUFFER_ONE_REG_WR | (R300_VAP_PORT_IDX0 >> 2) | (0 << R300_INDX_BUFFER_SKIP_SHIFT)); OUT_CS(offset_dwords << 2); OUT_CS_BUF_RELOC(indexBuffer, count_dwords, RADEON_GEM_DOMAIN_GTT, 0, 0); END_CS; } static boolean r300_setup_vertex_buffers(struct r300_context *r300) { struct pipe_vertex_buffer *vbuf = r300->vertex_buffer; struct pipe_vertex_element *velem = r300->vertex_element; struct pipe_buffer *pbuf; int ret; /* upload buffers first */ if (r300->any_user_vbs) { ret = r300_upload_user_buffers(r300); r300->any_user_vbs = false; } validate: for (int i = 0; i < r300->vertex_element_count; i++) { pbuf = vbuf[velem[i].vertex_buffer_index].buffer; if (!r300_add_buffer(r300->rws, pbuf, RADEON_GEM_DOMAIN_GTT, 0)) { r300->context.flush(&r300->context, 0, NULL); goto validate; } } if (!r300->rws->validate(r300->rws)) { r300->context.flush(&r300->context, 0, NULL); return r300->rws->validate(r300->rws); } return TRUE; } static void r300_shorten_ubyte_elts(struct r300_context* r300, struct pipe_buffer** elts, unsigned count) { struct pipe_screen* screen = r300->context.screen; struct pipe_buffer* new_elts; unsigned char *in_map; unsigned short *out_map; unsigned i; new_elts = screen->buffer_create(screen, 32, PIPE_BUFFER_USAGE_INDEX | PIPE_BUFFER_USAGE_CPU_WRITE | PIPE_BUFFER_USAGE_GPU_READ, 2 * count); in_map = pipe_buffer_map(screen, *elts, PIPE_BUFFER_USAGE_CPU_READ); out_map = pipe_buffer_map(screen, new_elts, PIPE_BUFFER_USAGE_CPU_WRITE); for (i = 0; i < count; i++) { *out_map = (unsigned short)*in_map; in_map++; out_map++; } pipe_buffer_unmap(screen, *elts); pipe_buffer_unmap(screen, new_elts); *elts = new_elts; } /* This is the fast-path drawing & emission for HW TCL. */ void r300_draw_range_elements(struct pipe_context* pipe, struct pipe_buffer* indexBuffer, unsigned indexSize, unsigned minIndex, unsigned maxIndex, unsigned mode, unsigned start, unsigned count) { struct r300_context* r300 = r300_context(pipe); struct pipe_buffer* orgIndexBuffer = indexBuffer; #if defined(ENABLE_ALT_NUM_VERTS) boolean alt_num_verts = r300_screen(pipe->screen)->caps->is_r500 && count > 65536; #else boolean alt_num_verts = FALSE; #endif unsigned short_count; if (!u_trim_pipe_prim(mode, &count)) { return; } r300_update_derived_state(r300); r300_emit_buffer_validate(r300); if (!r300_setup_vertex_buffers(r300)) { return; } if (indexSize == 1) { r300_shorten_ubyte_elts(r300, &indexBuffer, count); indexSize = 2; } r300_upload_index_buffer(r300, &indexBuffer, indexSize, start, count); if (!r300_add_buffer(r300->rws, indexBuffer, RADEON_GEM_DOMAIN_GTT, 0)) { goto cleanup; } if (!r300->rws->validate(r300->rws)) { goto cleanup; } u_upload_flush(r300->upload_vb); u_upload_flush(r300->upload_ib); r300_emit_dirty_state(r300); r300_emit_aos(r300, 0); if (alt_num_verts || count <= 65535) { r300_emit_draw_elements(r300, indexBuffer, indexSize, minIndex, maxIndex, mode, start, count); } else { do { short_count = MIN2(count, 65534); r300_emit_draw_elements(r300, indexBuffer, indexSize, minIndex, maxIndex, mode, start, short_count); start += short_count; count -= short_count; } while (count); } cleanup: if (indexBuffer != orgIndexBuffer) { pipe_buffer_reference( &indexBuffer, NULL ); } } /* Simple helpers for context setup. Should probably be moved to util. */ void r300_draw_elements(struct pipe_context* pipe, struct pipe_buffer* indexBuffer, unsigned indexSize, unsigned mode, unsigned start, unsigned count) { pipe->draw_range_elements(pipe, indexBuffer, indexSize, 0, ~0, mode, start, count); } void r300_draw_arrays(struct pipe_context* pipe, unsigned mode, unsigned start, unsigned count) { struct r300_context* r300 = r300_context(pipe); #if defined(ENABLE_ALT_NUM_VERTS) boolean alt_num_verts = r300_screen(pipe->screen)->caps->is_r500 && count > 65536; #else boolean alt_num_verts = FALSE; #endif unsigned short_count; if (!u_trim_pipe_prim(mode, &count)) { return; } r300_update_derived_state(r300); r300_emit_buffer_validate(r300); if (immd_is_good_idea(r300, count)) { r300_emit_draw_arrays_immediate(r300, mode, start, count); } else { if (!r300_setup_vertex_buffers(r300)) { return; } u_upload_flush(r300->upload_vb); r300_emit_dirty_state(r300); if (alt_num_verts || count <= 65535) { r300_emit_aos(r300, start); r300_emit_draw_arrays(r300, mode, count); } else { do { short_count = MIN2(count, 65535); r300_emit_aos(r300, start); r300_emit_draw_arrays(r300, mode, short_count); start += short_count; count -= short_count; } while (count); } } } /**************************************************************************** * The rest of this file is for SW TCL rendering only. Please be polite and * * keep these functions separated so that they are easier to locate. ~C. * ***************************************************************************/ /* SW TCL arrays, using Draw. */ void r300_swtcl_draw_arrays(struct pipe_context* pipe, unsigned mode, unsigned start, unsigned count) { struct r300_context* r300 = r300_context(pipe); int i; if (!u_trim_pipe_prim(mode, &count)) { return; } for (i = 0; i < r300->vertex_buffer_count; i++) { void* buf = pipe_buffer_map(pipe->screen, r300->vertex_buffer[i].buffer, PIPE_BUFFER_USAGE_CPU_READ); draw_set_mapped_vertex_buffer(r300->draw, i, buf); } draw_set_mapped_element_buffer(r300->draw, 0, NULL); draw_set_mapped_constant_buffer(r300->draw, PIPE_SHADER_VERTEX, 0, r300->shader_constants[PIPE_SHADER_VERTEX].constants, r300->shader_constants[PIPE_SHADER_VERTEX].count * (sizeof(float) * 4)); draw_arrays(r300->draw, mode, start, count); for (i = 0; i < r300->vertex_buffer_count; i++) { pipe_buffer_unmap(pipe->screen, r300->vertex_buffer[i].buffer); draw_set_mapped_vertex_buffer(r300->draw, i, NULL); } } /* SW TCL elements, using Draw. */ void r300_swtcl_draw_range_elements(struct pipe_context* pipe, struct pipe_buffer* indexBuffer, unsigned indexSize, unsigned minIndex, unsigned maxIndex, unsigned mode, unsigned start, unsigned count) { struct r300_context* r300 = r300_context(pipe); int i; void* indices; if (!u_trim_pipe_prim(mode, &count)) { return; } for (i = 0; i < r300->vertex_buffer_count; i++) { void* buf = pipe_buffer_map(pipe->screen, r300->vertex_buffer[i].buffer, PIPE_BUFFER_USAGE_CPU_READ); draw_set_mapped_vertex_buffer(r300->draw, i, buf); } indices = pipe_buffer_map(pipe->screen, indexBuffer, PIPE_BUFFER_USAGE_CPU_READ); draw_set_mapped_element_buffer_range(r300->draw, indexSize, minIndex, maxIndex, indices); draw_set_mapped_constant_buffer(r300->draw, PIPE_SHADER_VERTEX, 0, r300->shader_constants[PIPE_SHADER_VERTEX].constants, r300->shader_constants[PIPE_SHADER_VERTEX].count * (sizeof(float) * 4)); draw_arrays(r300->draw, mode, start, count); for (i = 0; i < r300->vertex_buffer_count; i++) { pipe_buffer_unmap(pipe->screen, r300->vertex_buffer[i].buffer); draw_set_mapped_vertex_buffer(r300->draw, i, NULL); } pipe_buffer_unmap(pipe->screen, indexBuffer); draw_set_mapped_element_buffer_range(r300->draw, 0, start, start + count - 1, NULL); } /* Object for rendering using Draw. */ struct r300_render { /* Parent class */ struct vbuf_render base; /* Pipe context */ struct r300_context* r300; /* Vertex information */ size_t vertex_size; unsigned prim; unsigned hwprim; /* VBO */ struct pipe_buffer* vbo; size_t vbo_size; size_t vbo_offset; size_t vbo_max_used; void * vbo_ptr; }; static INLINE struct r300_render* r300_render(struct vbuf_render* render) { return (struct r300_render*)render; } static const struct vertex_info* r300_render_get_vertex_info(struct vbuf_render* render) { struct r300_render* r300render = r300_render(render); struct r300_context* r300 = r300render->r300; r300_update_derived_state(r300); return (struct vertex_info*)r300->vertex_format_state.state; } static boolean r300_render_allocate_vertices(struct vbuf_render* render, ushort vertex_size, ushort count) { struct r300_render* r300render = r300_render(render); struct r300_context* r300 = r300render->r300; struct pipe_screen* screen = r300->context.screen; size_t size = (size_t)vertex_size * (size_t)count; if (size + r300render->vbo_offset > r300render->vbo_size) { pipe_buffer_reference(&r300->vbo, NULL); r300render->vbo = pipe_buffer_create(screen, 64, PIPE_BUFFER_USAGE_VERTEX, R300_MAX_VBO_SIZE); r300render->vbo_offset = 0; r300render->vbo_size = R300_MAX_VBO_SIZE; } r300render->vertex_size = vertex_size; r300->vbo = r300render->vbo; r300->vbo_offset = r300render->vbo_offset; return (r300render->vbo) ? TRUE : FALSE; } static void* r300_render_map_vertices(struct vbuf_render* render) { struct r300_render* r300render = r300_render(render); struct pipe_screen* screen = r300render->r300->context.screen; r300render->vbo_ptr = pipe_buffer_map(screen, r300render->vbo, PIPE_BUFFER_USAGE_CPU_WRITE); return ((uint8_t*)r300render->vbo_ptr + r300render->vbo_offset); } static void r300_render_unmap_vertices(struct vbuf_render* render, ushort min, ushort max) { struct r300_render* r300render = r300_render(render); struct pipe_screen* screen = r300render->r300->context.screen; CS_LOCALS(r300render->r300); BEGIN_CS(2); OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, max); END_CS; r300render->vbo_max_used = MAX2(r300render->vbo_max_used, r300render->vertex_size * (max + 1)); pipe_buffer_unmap(screen, r300render->vbo); } static void r300_render_release_vertices(struct vbuf_render* render) { struct r300_render* r300render = r300_render(render); r300render->vbo_offset += r300render->vbo_max_used; r300render->vbo_max_used = 0; } static boolean r300_render_set_primitive(struct vbuf_render* render, unsigned prim) { struct r300_render* r300render = r300_render(render); r300render->prim = prim; r300render->hwprim = r300_translate_primitive(prim); return TRUE; } static void r300_render_draw_arrays(struct vbuf_render* render, unsigned start, unsigned count) { struct r300_render* r300render = r300_render(render); struct r300_context* r300 = r300render->r300; CS_LOCALS(r300); r300_emit_dirty_state(r300); DBG(r300, DBG_DRAW, "r300: Doing vbuf render, count %d\n", count); BEGIN_CS(2); OUT_CS_PKT3(R300_PACKET3_3D_DRAW_VBUF_2, 0); OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_LIST | (count << 16) | r300render->hwprim); END_CS; } static void r300_render_draw(struct vbuf_render* render, const ushort* indices, uint count) { struct r300_render* r300render = r300_render(render); struct r300_context* r300 = r300render->r300; int i; CS_LOCALS(r300); r300_emit_dirty_state(r300); BEGIN_CS(2 + (count+1)/2); OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, (count+1)/2); OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) | r300render->hwprim); for (i = 0; i < count-1; i += 2) { OUT_CS(indices[i+1] << 16 | indices[i]); } if (count % 2) { OUT_CS(indices[count-1]); } END_CS; } static void r300_render_destroy(struct vbuf_render* render) { FREE(render); } static struct vbuf_render* r300_render_create(struct r300_context* r300) { struct r300_render* r300render = CALLOC_STRUCT(r300_render); r300render->r300 = r300; /* XXX find real numbers plz */ r300render->base.max_vertex_buffer_bytes = 128 * 1024; r300render->base.max_indices = 16 * 1024; r300render->base.get_vertex_info = r300_render_get_vertex_info; r300render->base.allocate_vertices = r300_render_allocate_vertices; r300render->base.map_vertices = r300_render_map_vertices; r300render->base.unmap_vertices = r300_render_unmap_vertices; r300render->base.set_primitive = r300_render_set_primitive; r300render->base.draw = r300_render_draw; r300render->base.draw_arrays = r300_render_draw_arrays; r300render->base.release_vertices = r300_render_release_vertices; r300render->base.destroy = r300_render_destroy; r300render->vbo = NULL; r300render->vbo_size = 0; r300render->vbo_offset = 0; return &r300render->base; } struct draw_stage* r300_draw_stage(struct r300_context* r300) { struct vbuf_render* render; struct draw_stage* stage; render = r300_render_create(r300); if (!render) { return NULL; } stage = draw_vbuf_stage(r300->draw, render); if (!stage) { render->destroy(render); return NULL; } draw_set_render(r300->draw, render); return stage; }