From fef6e36e0736a68e24d7844bae65a01de8359214 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Mon, 10 May 2010 21:11:21 -0600 Subject: mesa: more transform feedback infrastructure Includes GL_ARB_transform_feedback2 which encapsulates transform feedback state in objects. --- src/mesa/main/transformfeedback.c | 474 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 460 insertions(+), 14 deletions(-) (limited to 'src/mesa/main/transformfeedback.c') diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c index 74519ba38a..528e7d954b 100644 --- a/src/mesa/main/transformfeedback.c +++ b/src/mesa/main/transformfeedback.c @@ -33,12 +33,54 @@ #include "buffers.h" #include "bufferobj.h" #include "context.h" +#include "hash.h" #include "transformfeedback.h" #include "shader/prog_parameter.h" #include "shader/shader_api.h" +/** + * Do reference counting of transform feedback buffers. + */ +static void +reference_transform_feedback_object(struct gl_transform_feedback_object **ptr, + struct gl_transform_feedback_object *obj) +{ + if (*ptr == obj) + return; + + if (*ptr) { + /* Unreference the old object */ + struct gl_transform_feedback_object *oldObj = *ptr; + + ASSERT(oldObj->RefCount > 0); + oldObj->RefCount--; + + if (oldObj->RefCount == 0) { + GET_CURRENT_CONTEXT(ctx); + if (ctx) + ctx->Driver.DeleteTransformFeedback(ctx, oldObj); + } + + *ptr = NULL; + } + ASSERT(!*ptr); + + if (obj) { + /* reference new object */ + if (obj->RefCount == 0) { + _mesa_problem(NULL, "referencing deleted transform feedback object"); + *ptr = NULL; + } + else { + obj->RefCount++; + *ptr = obj; + } + } +} + + /** * Check if the given primitive mode (as in glBegin(mode)) is compatible * with the current transform feedback mode (if it's enabled). @@ -49,7 +91,7 @@ GLboolean _mesa_validate_primitive_mode(GLcontext *ctx, GLenum mode) { - if (ctx->TransformFeedback.Active) { + if (ctx->TransformFeedback.CurrentObject->Active) { switch (mode) { case GL_POINTS: return ctx->TransformFeedback.Mode == GL_POINTS; @@ -74,7 +116,7 @@ _mesa_validate_primitive_mode(GLcontext *ctx, GLenum mode) GLboolean _mesa_validate_transform_feedback_buffers(GLcontext *ctx) { - + /* XXX to do */ return GL_TRUE; } @@ -86,29 +128,173 @@ _mesa_validate_transform_feedback_buffers(GLcontext *ctx) void _mesa_init_transform_feedback(GLcontext *ctx) { + if (!ctx->Driver.NewTransformFeedback) { + /* this feature/extension may not be supported by the driver */ + return; + } + + ctx->TransformFeedback.DefaultObject = + ctx->Driver.NewTransformFeedback(ctx, 0); + + assert(ctx->TransformFeedback.DefaultObject->RefCount == 1); + + reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject, + ctx->TransformFeedback.DefaultObject); + + assert(ctx->TransformFeedback.DefaultObject->RefCount == 2); + + ctx->TransformFeedback.Objects = _mesa_NewHashTable(); + _mesa_reference_buffer_object(ctx, &ctx->TransformFeedback.CurrentBuffer, ctx->Shared->NullBufferObj); } + +/** + * Callback for _mesa_HashDeleteAll(). + */ +static void +delete_cb(GLuint key, void *data, void *userData) +{ + GLcontext *ctx = (GLcontext *) userData; + struct gl_transform_feedback_object *obj = + (struct gl_transform_feedback_object *) data; + + ctx->Driver.DeleteTransformFeedback(ctx, obj); +} + + /** * Per-context free/clean-up for transform feedback. */ void _mesa_free_transform_feedback(GLcontext *ctx) { + if (!ctx->Driver.NewTransformFeedback) { + /* this feature/extension may not be supported by the driver */ + return; + } + _mesa_reference_buffer_object(ctx, &ctx->TransformFeedback.CurrentBuffer, NULL); + + /* Delete all feedback objects */ + _mesa_HashDeleteAll(ctx->TransformFeedback.Objects, delete_cb, ctx); + + /* Delete the default feedback object */ + assert(ctx->Driver.DeleteTransformFeedback); + ctx->Driver.DeleteTransformFeedback(ctx, ctx->TransformFeedback.DefaultObject); + + ctx->TransformFeedback.CurrentObject = NULL; } +/** Default fallback for ctx->Driver.NewTransformFeedback() */ +static struct gl_transform_feedback_object * +new_transform_feedback(GLcontext *ctx, GLuint name) +{ + struct gl_transform_feedback_object *obj; + obj = CALLOC_STRUCT(gl_transform_feedback_object); + if (obj) { + obj->Name = name; + obj->RefCount = 1; + } + return obj; +} + +/** Default fallback for ctx->Driver.DeleteTransformFeedback() */ +static void +delete_transform_feedback(GLcontext *ctx, + struct gl_transform_feedback_object *obj) +{ + GLuint i; + + for (i = 0; i < Elements(obj->Buffers); i++) { + _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL); + } + + free(obj); +} + +/** Default fallback for ctx->Driver.BeginTransformFeedback() */ +static void +begin_transform_feedback(GLcontext *ctx, GLenum mode, + struct gl_transform_feedback_object *obj) +{ + /* nop */ +} + +/** Default fallback for ctx->Driver.EndTransformFeedback() */ +static void +end_transform_feedback(GLcontext *ctx, + struct gl_transform_feedback_object *obj) +{ + /* nop */ +} + +/** Default fallback for ctx->Driver.PauseTransformFeedback() */ +static void +pause_transform_feedback(GLcontext *ctx, + struct gl_transform_feedback_object *obj) +{ + /* nop */ +} + +/** Default fallback for ctx->Driver.ResumeTransformFeedback() */ +static void +resume_transform_feedback(GLcontext *ctx, + struct gl_transform_feedback_object *obj) +{ + /* nop */ +} + +/** Default fallback for ctx->Driver.DrawTransformFeedback() */ +static void +draw_transform_feedback(GLcontext *ctx, GLenum mode, + struct gl_transform_feedback_object *obj) +{ + /* XXX to do */ + /* + * Get number of vertices in obj's feedback buffer. + * Call ctx->Exec.DrawArrays(mode, 0, count); + */ +} + + +/** + * Plug in default device driver functions for transform feedback. + * Most drivers will override some/all of these. + */ +void +_mesa_init_transform_feedback_functions(struct dd_function_table *driver) +{ + driver->NewTransformFeedback = new_transform_feedback; + driver->DeleteTransformFeedback = delete_transform_feedback; + driver->BeginTransformFeedback = begin_transform_feedback; + driver->EndTransformFeedback = end_transform_feedback; + driver->PauseTransformFeedback = pause_transform_feedback; + driver->ResumeTransformFeedback = resume_transform_feedback; + driver->DrawTransformFeedback = draw_transform_feedback; +} + + + +/** + ** Begin API functions + **/ + + void GLAPIENTRY _mesa_BeginTransformFeedback(GLenum mode) { + struct gl_transform_feedback_object *obj; GET_CURRENT_CONTEXT(ctx); + obj = ctx->TransformFeedback.CurrentObject; + switch (mode) { case GL_POINTS: case GL_LINES: @@ -120,29 +306,38 @@ _mesa_BeginTransformFeedback(GLenum mode) return; } - if (ctx->TransformFeedback.Active) { + if (obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginTransformFeedback(already active)"); return; } - ctx->TransformFeedback.Active = GL_TRUE; + obj->Active = GL_TRUE; ctx->TransformFeedback.Mode = mode; + + assert(ctx->Driver.BeginTransformFeedback); + ctx->Driver.BeginTransformFeedback(ctx, mode, obj); } void GLAPIENTRY _mesa_EndTransformFeedback(void) { + struct gl_transform_feedback_object *obj; GET_CURRENT_CONTEXT(ctx); - if (!ctx->TransformFeedback.Active) { + obj = ctx->TransformFeedback.CurrentObject; + + if (!obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glEndTransformFeedback(not active)"); return; } - ctx->TransformFeedback.Active = GL_FALSE; + ctx->TransformFeedback.CurrentObject->Active = GL_FALSE; + + assert(ctx->Driver.EndTransformFeedback); + ctx->Driver.EndTransformFeedback(ctx, obj); } @@ -154,6 +349,9 @@ bind_buffer_range(GLcontext *ctx, GLuint index, struct gl_buffer_object *bufObj, GLintptr offset, GLsizeiptr size) { + struct gl_transform_feedback_object *obj = + ctx->TransformFeedback.CurrentObject; + /* The general binding point */ _mesa_reference_buffer_object(ctx, &ctx->TransformFeedback.CurrentBuffer, @@ -161,13 +359,13 @@ bind_buffer_range(GLcontext *ctx, GLuint index, /* The per-attribute binding point */ _mesa_reference_buffer_object(ctx, - &ctx->TransformFeedback.Buffers[index], + &obj->Buffers[index], bufObj); - ctx->TransformFeedback.BufferNames[index] = bufObj->Name; + obj->BufferNames[index] = bufObj->Name; - ctx->TransformFeedback.Offset[index] = offset; - ctx->TransformFeedback.Size[index] = size; + obj->Offset[index] = offset; + obj->Size[index] = size; } @@ -179,6 +377,7 @@ void GLAPIENTRY _mesa_BindBufferRange(GLenum target, GLuint index, GLuint buffer, GLintptr offset, GLsizeiptr size) { + struct gl_transform_feedback_object *obj; struct gl_buffer_object *bufObj; GET_CURRENT_CONTEXT(ctx); @@ -187,7 +386,9 @@ _mesa_BindBufferRange(GLenum target, GLuint index, return; } - if (ctx->TransformFeedback.Active) { + obj = ctx->TransformFeedback.CurrentObject; + + if (obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBindBufferRange(transform feedback active)"); return; @@ -235,16 +436,19 @@ _mesa_BindBufferRange(GLenum target, GLuint index, void GLAPIENTRY _mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer) { + struct gl_transform_feedback_object *obj; struct gl_buffer_object *bufObj; - GET_CURRENT_CONTEXT(ctx); GLsizeiptr size; + GET_CURRENT_CONTEXT(ctx); if (target != GL_TRANSFORM_FEEDBACK_BUFFER) { _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferBase(target)"); return; } - if (ctx->TransformFeedback.Active) { + obj = ctx->TransformFeedback.CurrentObject; + + if (obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBindBufferRange(transform feedback active)"); return; @@ -280,6 +484,7 @@ void GLAPIENTRY _mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer, GLintptr offset) { + struct gl_transform_feedback_object *obj; struct gl_buffer_object *bufObj; GET_CURRENT_CONTEXT(ctx); GLsizeiptr size; @@ -289,7 +494,9 @@ _mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer, return; } - if (ctx->TransformFeedback.Active) { + obj = ctx->TransformFeedback.CurrentObject; + + if (obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBindBufferRange(transform feedback active)"); return; @@ -433,3 +640,242 @@ _mesa_GetTransformFeedbackVarying(GLuint program, GLuint index, } } + + +static struct gl_transform_feedback_object * +lookup_transform_feedback_object(GLcontext *ctx, GLuint name) +{ + if (name == 0) { + return ctx->TransformFeedback.DefaultObject; + } + else + return (struct gl_transform_feedback_object *) + _mesa_HashLookup(ctx->TransformFeedback.Objects, name); +} + + +/** + * Create new transform feedback objects. Transform feedback objects + * encapsulate the state related to transform feedback to allow quickly + * switching state (and drawing the results, below). + * Part of GL_ARB_transform_feedback2. + */ +void GLAPIENTRY +_mesa_GenTransformFeedbacks(GLsizei n, GLuint *names) +{ + GLuint first; + GET_CURRENT_CONTEXT(ctx); + + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (n < 0) { + _mesa_error(ctx, GL_INVALID_VALUE, "glGenTransformFeedbacks(n < 0)"); + return; + } + + if (!names) + return; + + /* we don't need contiguous IDs, but this might be faster */ + first = _mesa_HashFindFreeKeyBlock(ctx->TransformFeedback.Objects, n); + if (first) { + GLsizei i; + for (i = 0; i < n; i++) { + struct gl_transform_feedback_object *obj + = ctx->Driver.NewTransformFeedback(ctx, first + i); + if (!obj) { + _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenTransformFeedbacks"); + return; + } + names[i] = first + i; + _mesa_HashInsert(ctx->TransformFeedback.Objects, first + i, obj); + } + } + else { + _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenTransformFeedbacks"); + } +} + + +/** + * Is the given ID a transform feedback object? + * Part of GL_ARB_transform_feedback2. + */ +GLboolean GLAPIENTRY +_mesa_IsTransformFeedback(GLuint name) +{ + GET_CURRENT_CONTEXT(ctx); + + ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); + + if (name && lookup_transform_feedback_object(ctx, name)) + return GL_TRUE; + else + return GL_FALSE; +} + + +/** + * Bind the given transform feedback object. + * Part of GL_ARB_transform_feedback2. + */ +void GLAPIENTRY +_mesa_BindTransformFeedback(GLenum target, uint name) +{ + struct gl_transform_feedback_object *obj; + GET_CURRENT_CONTEXT(ctx); + + if (target != GL_TRANSFORM_FEEDBACK) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBindTransformFeedback(target)"); + return; + } + + if (ctx->TransformFeedback.CurrentObject->Active && + !ctx->TransformFeedback.CurrentObject->Paused) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindTransformFeedback(transform is active, or not paused)"); + return; + } + + obj = lookup_transform_feedback_object(ctx, name); + if (!obj) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBindTransformFeedback(name=%u)", name); + return; + } + + reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject, + obj); +} + + +/** + * Delete the given transform feedback objects. + * Part of GL_ARB_transform_feedback2. + */ +void GLAPIENTRY +_mesa_DeleteTransformFeedbacks(GLsizei n, const GLuint *names) +{ + GLint i; + GET_CURRENT_CONTEXT(ctx); + + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (n < 0) { + _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteTransformFeedbacks(n < 0)"); + return; + } + + if (!names) + return; + + for (i = 0; i < n; i++) { + if (names[i] > 0) { + struct gl_transform_feedback_object *obj + = lookup_transform_feedback_object(ctx, names[i]); + if (obj) { + if (obj->Active) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDeleteTransformFeedbacks(object %u is active)", + names[i]); + return; + } + _mesa_HashRemove(ctx->TransformFeedback.Objects, names[i]); + /* unref, but object may not be deleted until later */ + reference_transform_feedback_object(&obj, NULL); + } + } + } +} + + +/** + * Pause transform feedback. + * Part of GL_ARB_transform_feedback2. + */ +void GLAPIENTRY +_mesa_PauseTransformFeedback(void) +{ + struct gl_transform_feedback_object *obj; + GET_CURRENT_CONTEXT(ctx); + + obj = ctx->TransformFeedback.CurrentObject; + + if (!obj->Active || obj->Paused) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glPauseTransformFeedback(feedback not active or already paused)"); + return; + } + + obj->Paused = GL_TRUE; + + assert(ctx->Driver.PauseTransformFeedback); + ctx->Driver.PauseTransformFeedback(ctx, obj); +} + + +/** + * Resume transform feedback. + * Part of GL_ARB_transform_feedback2. + */ +void GLAPIENTRY +_mesa_ResumeTransformFeedback(void) +{ + struct gl_transform_feedback_object *obj; + GET_CURRENT_CONTEXT(ctx); + + obj = ctx->TransformFeedback.CurrentObject; + + if (!obj->Active || !obj->Paused) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glPauseTransformFeedback(feedback not active or not paused)"); + return; + } + + obj->Paused = GL_FALSE; + + assert(ctx->Driver.ResumeTransformFeedback); + ctx->Driver.ResumeTransformFeedback(ctx, obj); +} + + +/** + * Draw the vertex data in a transform feedback object. + * \param mode GL_POINTS, GL_LINES, GL_TRIANGLE_STRIP, etc. + * \param name the transform feedback object + * The number of vertices comes from the transform feedback object. + * User still has to setup of the vertex attribute info with + * glVertexPointer, glColorPointer, etc. + * Part of GL_ARB_transform_feedback2. + */ +void GLAPIENTRY +_mesa_DrawTransformFeedback(GLenum mode, GLuint name) +{ + GET_CURRENT_CONTEXT(ctx); + struct gl_transform_feedback_object *obj = + lookup_transform_feedback_object(ctx, name); + + if (!obj) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glDrawTransformFeedback(name = %u)", name); + return; + } + + /* XXX check if EndTransformFeedback has never been called while + * the object was bound + */ + + assert(ctx->Driver.DrawTransformFeedback); + ctx->Driver.DrawTransformFeedback(ctx, mode, obj); +} + + +/* +XXX misc to do: + +glGet*() for + +GL_TRANSFORM_FEEDBACK_BUFFER_PAUSED +GL_TRANSFORM_FEEDBACK_BUFFER_ACTIVE +GL_TRANSFORM_FEEDBACK_BINDING +*/ -- cgit v1.2.3