diff options
| -rw-r--r-- | src/mesa/main/transformfeedback.c | 427 | ||||
| -rw-r--r-- | src/mesa/main/transformfeedback.h | 71 |
2 files changed, 498 insertions, 0 deletions
diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c new file mode 100644 index 00000000000..3490110baef --- /dev/null +++ b/src/mesa/main/transformfeedback.c @@ -0,0 +1,427 @@ +/* + * Mesa 3-D graphics library + * + * Copyright (C) 2010 VMware, Inc. 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 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. + */ + + +/* + * Vertex transform feedback support. + * + * Authors: + * Brian Paul + */ + + +#include "buffers.h" +#include "bufferobj.h" +#include "context.h" +#include "enums.h" +#include "transformfeedback.h" + +#include "shader/prog_parameter.h" +#include "shader/shader_api.h" + + +/** + * Check if the given primitive mode (as in glBegin(mode)) is compatible + * with the current transform feedback mode (if it's enabled). + * This is to be called from glBegin(), glDrawArrays(), glDrawElements(), etc. + * + * \return GL_TRUE if the mode is OK, GL_FALSE otherwise. + */ +GLboolean +_mesa_validate_primitive_mode(GLcontext *ctx, GLenum mode) +{ + if (ctx->TransformFeedback.Active) { + switch (mode) { + case GL_POINTS: + return ctx->TransformFeedback.Mode == GL_POINTS; + case GL_LINES: + case GL_LINE_STRIP: + case GL_LINE_LOOP: + return ctx->TransformFeedback.Mode == GL_LINES; + default: + return ctx->TransformFeedback.Mode == GL_TRIANGLES; + } + } + return GL_TRUE; +} + + +/** + * Check that all the buffer objects currently bound for transform + * feedback actually exist. Raise a GL_INVALID_OPERATION error if + * any buffers are missing. + * \return GL_TRUE for success, GL_FALSE if error + */ +GLboolean +_mesa_validate_transform_feedback_buffers(GLcontext *ctx) +{ + + return GL_TRUE; +} + + + +/** + * Per-context init for transform feedback. + */ +void +_mesa_init_transform_feedback(GLcontext *ctx) +{ + _mesa_reference_buffer_object(ctx, + &ctx->TransformFeedback.CurrentBuffer, + ctx->Shared->NullBufferObj); +} + + +/** + * Per-context free/clean-up for transform feedback. + */ +void +_mesa_free_transform_feedback(GLcontext *ctx) +{ + _mesa_reference_buffer_object(ctx, + &ctx->TransformFeedback.CurrentBuffer, + NULL); +} + + +void GLAPIENTRY +_mesa_BeginTransformFeedback(GLenum mode) +{ + GET_CURRENT_CONTEXT(ctx); + + switch (mode) { + case GL_POINTS: + case GL_LINES: + case GL_TRIANGLES: + /* legal */ + break; + default: + _mesa_error(ctx, GL_INVALID_ENUM, "glBeginTransformFeedback(mode)"); + return; + } + + if (ctx->TransformFeedback.Active) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBeginTransformFeedback(already active)"); + return; + } + + ctx->TransformFeedback.Active = GL_TRUE; + ctx->TransformFeedback.Mode = mode; +} + + +void GLAPIENTRY +_mesa_EndTransformFeedback(void) +{ + GET_CURRENT_CONTEXT(ctx); + + if (!ctx->TransformFeedback.Active) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glEndTransformFeedback(not active)"); + return; + } + + ctx->TransformFeedback.Active = GL_FALSE; +} + + +/** + * Helper used by BindBufferRange() and BindBufferBase(). + */ +static void +bind_buffer_range(GLcontext *ctx, GLuint index, + struct gl_buffer_object *bufObj, + GLintptr offset, GLsizeiptr size) +{ + /* The general binding point */ + _mesa_reference_buffer_object(ctx, + &ctx->TransformFeedback.CurrentBuffer, + bufObj); + + /* The per-attribute binding point */ + _mesa_reference_buffer_object(ctx, + &ctx->TransformFeedback.Buffers[index], + bufObj); + + ctx->TransformFeedback.BufferNames[index] = bufObj->Name; + + ctx->TransformFeedback.Offset[index] = offset; + ctx->TransformFeedback.Size[index] = size; +} + + +/** + * Specify a buffer object to receive vertex shader results. Plus, + * specify the starting offset to place the results, and max size. + */ +void GLAPIENTRY +_mesa_BindBufferRange(GLenum target, GLuint index, + GLuint buffer, GLintptr offset, GLsizeiptr size) +{ + struct gl_buffer_object *bufObj; + GET_CURRENT_CONTEXT(ctx); + + if (target != GL_TRANSFORM_FEEDBACK_BUFFER) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferRange(target)"); + return; + } + + if (ctx->TransformFeedback.Active) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindBufferRange(transform feedback active)"); + return; + } + + if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) { + _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index); + return; + } + + if ((size <= 0) || (size & 0x3)) { + /* must be positive and multiple of four */ + _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(size%d)", size); + return; + } + + if (offset & 0x3) { + /* must be multiple of four */ + _mesa_error(ctx, GL_INVALID_VALUE, + "glBindBufferRange(offset=%d)", offset); + return; + } + + bufObj = _mesa_lookup_bufferobj(ctx, buffer); + if (!bufObj) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindBufferRange(invalid buffer=%u)", buffer); + return; + } + + if (offset + size >= bufObj->Size) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glBindBufferRange(offset + size > buffer size)", size); + return; + } + + bind_buffer_range(ctx, index, bufObj, offset, size); +} + + +/** + * Specify a buffer object to receive vertex shader results. + * As above, but start at offset = 0. + */ +void GLAPIENTRY +_mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer) +{ + struct gl_buffer_object *bufObj; + GET_CURRENT_CONTEXT(ctx); + GLsizeiptr size; + + if (target != GL_TRANSFORM_FEEDBACK_BUFFER) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferBase(target)"); + return; + } + + if (ctx->TransformFeedback.Active) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindBufferRange(transform feedback active)"); + return; + } + + if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) { + _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index); + return; + } + + bufObj = _mesa_lookup_bufferobj(ctx, buffer); + if (!bufObj) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindBufferBase(invalid buffer=%u)", buffer); + return; + } + + /* default size is the buffer size rounded down to nearest + * multiple of four. + */ + size = bufObj->Size & ~0x3; + + bind_buffer_range(ctx, index, bufObj, 0, size); +} + + +/** + * Specify a buffer object to receive vertex shader results, plus the + * offset in the buffer to start placing results. + * This function is part of GL_EXT_transform_feedback, but not GL3. + */ +void GLAPIENTRY +_mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer, + GLintptr offset) +{ + struct gl_buffer_object *bufObj; + GET_CURRENT_CONTEXT(ctx); + GLsizeiptr size; + + if (target != GL_TRANSFORM_FEEDBACK_BUFFER) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferOffsetEXT(target)"); + return; + } + + if (ctx->TransformFeedback.Active) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindBufferRange(transform feedback active)"); + return; + } + + if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glBindBufferOffsetEXT(index=%d)", index); + return; + } + + bufObj = _mesa_lookup_bufferobj(ctx, buffer); + if (!bufObj) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindBufferOffsetEXT(invalid buffer=%u)", buffer); + return; + } + + /* default size is the buffer size rounded down to nearest + * multiple of four. + */ + size = (bufObj->Size - offset) & ~0x3; + + bind_buffer_range(ctx, index, bufObj, offset, size); +} + + +/** + * This function specifies the vertex shader outputs to be written + * to the feedback buffer(s), and in what order. + */ +void GLAPIENTRY +_mesa_TransformFeedbackVaryings(GLuint program, GLsizei count, + const GLchar **varyings, GLenum bufferMode) +{ + struct gl_shader_program *shProg; + GLuint i; + GET_CURRENT_CONTEXT(ctx); + + switch (bufferMode) { + case GL_INTERLEAVED_ATTRIBS: + break; + case GL_SEPARATE_ATTRIBS: + break; + default: + _mesa_error(ctx, GL_INVALID_ENUM, + "glTransformFeedbackVaryings(bufferMode)"); + return; + } + + if (count < 0 || count > ctx->Const.MaxTransformFeedbackSeparateAttribs) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glTransformFeedbackVaryings(count=%d)", count); + return; + } + + shProg = _mesa_lookup_shader_program(ctx, program); + if (!shProg) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glTransformFeedbackVaryings(program=%u)", program); + return; + } + + /* free existing varyings, if any */ + for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) { + free(shProg->TransformFeedback.VaryingNames[i]); + } + free(shProg->TransformFeedback.VaryingNames); + + /* allocate new memory for varying names */ + shProg->TransformFeedback.VaryingNames = + (GLchar **) malloc(count * sizeof(GLchar *)); + + if (!shProg->TransformFeedback.VaryingNames) { + _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTransformFeedbackVaryings()"); + return; + } + + /* Save the new names and the count */ + for (i = 0; i < (GLuint) count; i++) { + shProg->TransformFeedback.VaryingNames[i] = _mesa_strdup(varyings[i]); + } + shProg->TransformFeedback.NumVarying = count; + + shProg->TransformFeedback.BufferMode = bufferMode; + + /* The varyings won't be used until shader link time */ +} + + +/** + * Get info about the vertex shader's outputs which are to be written + * to the feedback buffer(s). + */ +void GLAPIENTRY +_mesa_GetTransformFeedbackVarying(GLuint program, GLuint index, + GLsizei bufSize, GLsizei *length, + GLsizei *size, GLenum *type, GLchar *name) +{ + const struct gl_shader_program *shProg; + const GLchar *varyingName; + GLint v; + GET_CURRENT_CONTEXT(ctx); + + shProg = _mesa_lookup_shader_program(ctx, program); + if (!shProg) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glGetTransformFeedbackVaryings(program=%u)", program); + return; + } + + if (index >= shProg->TransformFeedback.NumVarying) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glGetTransformFeedbackVaryings(index=%u)", index); + return; + } + + varyingName = shProg->TransformFeedback.VaryingNames[index]; + + v = _mesa_lookup_parameter_index(shProg->Varying, -1, varyingName); + if (v >= 0) { + struct gl_program_parameter *param = &shProg->Varying->Parameters[v]; + + /* return the varying's name and length */ + _mesa_copy_string(name, bufSize, length, varyingName); + + /* return the datatype and value's size (in datatype units) */ + if (type) + *type = param->Type; + if (size) + *size = param->Size; + } +} + diff --git a/src/mesa/main/transformfeedback.h b/src/mesa/main/transformfeedback.h new file mode 100644 index 00000000000..e89cc414736 --- /dev/null +++ b/src/mesa/main/transformfeedback.h @@ -0,0 +1,71 @@ +/* + * Mesa 3-D graphics library + * + * Copyright (C) 2010 VMware, Inc. 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 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. + */ + + +#ifndef TRANSFORM_FEEDBACK_H +#define TRANSFORM_FEEDBACK_H + +#include "glheader.h" + + +extern GLboolean +_mesa_validate_primitive_mode(GLcontext *ctx, GLenum mode); + +extern GLboolean +_mesa_validate_transform_feedback_buffers(GLcontext *ctx); + +extern void +_mesa_init_transform_feedback(GLcontext *ctx); + +extern void +_mesa_free_transform_feedback(GLcontext *ctx); + + +extern void GLAPIENTRY +_mesa_BeginTransformFeedback(GLenum mode); + +extern void GLAPIENTRY +_mesa_EndTransformFeedback(void); + +extern void GLAPIENTRY +_mesa_BindBufferRange(GLenum target, GLuint index, + GLuint buffer, GLintptr offset, GLsizeiptr size); + +extern void GLAPIENTRY +_mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer); + +extern void GLAPIENTRY +_mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer, + GLintptr offset); + +extern void GLAPIENTRY +_mesa_TransformFeedbackVaryings(GLuint program, GLsizei count, + const GLchar **varyings, GLenum bufferMode); + +extern void GLAPIENTRY +_mesa_GetTransformFeedbackVarying(GLuint program, GLuint index, + GLsizei bufSize, GLsizei *length, + GLsizei *size, GLenum *type, GLchar *name); + + +#endif /* TRANSFORM_FEEDBACK_H */ |