Mesa (master): mesa: implement GL3 glClearBuffer() functions
Brian Paul
brianp at kemper.freedesktop.org
Wed Dec 30 16:47:01 UTC 2009
Module: Mesa
Branch: master
Commit: 2b5ece5746585fd1b6ffd4768763dfc5709699ab
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=2b5ece5746585fd1b6ffd4768763dfc5709699ab
Author: Brian Paul <brianp at vmware.com>
Date: Wed Dec 30 09:25:24 2009 -0700
mesa: implement GL3 glClearBuffer() functions
These functions clear color/depth/stencil buffers with a value that's
passed to the function, rather than the context clear values.
For now these functions are implemented in terms of the existing
ctx->Driver.Clear() hook. In the future when we have non-normalized
integer and unsigned integer color buffer formats we'll need new
driver hook(s) to pass int and uint clear values to the driver.
Note: these functions are not hooked into the dispatch table at this time.
---
src/mesa/main/clear.c | 344 +++++++++++++++++++++++++++++++++++++++++++++++++
src/mesa/main/clear.h | 13 ++
2 files changed, 357 insertions(+), 0 deletions(-)
diff --git a/src/mesa/main/clear.c b/src/mesa/main/clear.c
index 63388f4..4a3c111 100644
--- a/src/mesa/main/clear.c
+++ b/src/mesa/main/clear.c
@@ -34,6 +34,7 @@
#include "clear.h"
#include "context.h"
#include "colormac.h"
+#include "enums.h"
#include "state.h"
@@ -182,3 +183,346 @@ _mesa_Clear( GLbitfield mask )
ctx->Driver.Clear(ctx, bufferMask);
}
}
+
+
+/** Returned by make_color_buffer_mask() for errors */
+#define INVALID_MASK ~0x0
+
+
+/**
+ * Convert the glClearBuffer 'drawbuffer' parameter into a bitmask of
+ * BUFFER_BIT_x values.
+ * Return INVALID_MASK if the drawbuffer value is invalid.
+ */
+static GLbitfield
+make_color_buffer_mask(GLcontext *ctx, GLint drawbuffer)
+{
+ const struct gl_renderbuffer_attachment *att = ctx->DrawBuffer->Attachment;
+ GLbitfield mask = 0x0;
+
+ switch (drawbuffer) {
+ case GL_FRONT:
+ if (att[BUFFER_FRONT_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_LEFT;
+ if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_RIGHT;
+ break;
+ case GL_BACK:
+ if (att[BUFFER_BACK_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_LEFT;
+ if (att[BUFFER_BACK_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_RIGHT;
+ break;
+ case GL_LEFT:
+ if (att[BUFFER_FRONT_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_LEFT;
+ if (att[BUFFER_BACK_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_LEFT;
+ break;
+ case GL_RIGHT:
+ if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_RIGHT;
+ if (att[BUFFER_BACK_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_RIGHT;
+ break;
+ case GL_FRONT_AND_BACK:
+ if (att[BUFFER_FRONT_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_LEFT;
+ if (att[BUFFER_BACK_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_LEFT;
+ if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_RIGHT;
+ if (att[BUFFER_BACK_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_RIGHT;
+ break;
+ default:
+ if (drawbuffer < 0 || drawbuffer >= ctx->Const.MaxDrawBuffers) {
+ mask = INVALID_MASK;
+ }
+ else if (att[BUFFER_COLOR0 + drawbuffer].Renderbuffer) {
+ mask |= (BUFFER_BIT_COLOR0 << drawbuffer);
+ }
+ }
+
+ return mask;
+}
+
+
+
+/**
+ * New in GL 3.0
+ * Clear signed integer color buffer or stencil buffer (not depth).
+ */
+void GLAPIENTRY
+_mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (!ctx->DrawBuffer->Visual.rgbMode) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glClearBufferiv()");
+ return;
+ }
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ switch (buffer) {
+ case GL_STENCIL:
+ if (drawbuffer != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else {
+ /* Save current stencil clear value, set to 'value', do the
+ * stencil clear and restore the clear value.
+ * XXX in the future we may have a new ctx->Driver.ClearBuffer()
+ * hook instead.
+ */
+ const GLuint clearSave = ctx->Stencil.Clear;
+ ctx->Stencil.Clear = *value;
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, *value);
+ ctx->Driver.Clear(ctx, BUFFER_BIT_STENCIL);
+ ctx->Stencil.Clear = clearSave;
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, clearSave);
+ }
+ break;
+ case GL_COLOR:
+ {
+ const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
+ if (mask == INVALID_MASK) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else if (mask) {
+ /* XXX note: we're putting the integer clear values into the
+ * floating point state var. This will not always work. We'll
+ * need a new ctx->Driver.ClearBuffer() hook....
+ */
+ GLfloat clearSave[4];
+ /* save color */
+ COPY_4V(clearSave, ctx->Color.ClearColor);
+ /* set color */
+ COPY_4V(ctx->Color.ClearColor, value);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
+ /* clear buffer(s) */
+ ctx->Driver.Clear(ctx, mask);
+ /* restore color */
+ COPY_4V(ctx->Color.ClearColor, clearSave);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, clearSave);
+ }
+ }
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferiv(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+}
+
+
+/**
+ * New in GL 3.0
+ * Clear unsigned integer color buffer (not depth, not stencil).
+ */
+void GLAPIENTRY
+_mesa_ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint *value)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (!ctx->DrawBuffer->Visual.rgbMode) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glClearBufferuiv()");
+ return;
+ }
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ switch (buffer) {
+ case GL_COLOR:
+ {
+ const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
+ if (mask == INVALID_MASK) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else if (mask) {
+ /* XXX note: we're putting the uint clear values into the
+ * floating point state var. This will not always work. We'll
+ * need a new ctx->Driver.ClearBuffer() hook....
+ */
+ GLfloat clearSave[4];
+ /* save color */
+ COPY_4V(clearSave, ctx->Color.ClearColor);
+ /* set color */
+ COPY_4V(ctx->Color.ClearColor, value);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
+ /* clear buffer(s) */
+ ctx->Driver.Clear(ctx, mask);
+ /* restore color */
+ COPY_4V(ctx->Color.ClearColor, clearSave);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, clearSave);
+ }
+ }
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferuiv(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+}
+
+
+/**
+ * New in GL 3.0
+ * Clear fixed-pt or float color buffer or depth buffer (not stencil).
+ */
+void GLAPIENTRY
+_mesa_ClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat *value)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (!ctx->DrawBuffer->Visual.rgbMode) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glClearBufferfv()");
+ return;
+ }
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ switch (buffer) {
+ case GL_DEPTH:
+ if (drawbuffer != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else {
+ /* Save current depth clear value, set to 'value', do the
+ * depth clear and restore the clear value.
+ * XXX in the future we may have a new ctx->Driver.ClearBuffer()
+ * hook instead.
+ */
+ const GLfloat clearSave = ctx->Depth.Clear;
+ ctx->Depth.Clear = *value;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, *value);
+ ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH);
+ ctx->Depth.Clear = clearSave;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, clearSave);
+ }
+ /* clear depth buffer to value */
+ break;
+ case GL_COLOR:
+ {
+ const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
+ if (mask == INVALID_MASK) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else if (mask) {
+ GLfloat clearSave[4];
+ /* save color */
+ COPY_4V(clearSave, ctx->Color.ClearColor);
+ /* set color */
+ COPY_4V(ctx->Color.ClearColor, value);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
+ /* clear buffer(s) */
+ ctx->Driver.Clear(ctx, mask);
+ /* restore color */
+ COPY_4V(ctx->Color.ClearColor, clearSave);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, clearSave);
+ }
+ }
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfv(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+}
+
+
+/**
+ * New in GL 3.0
+ * Clear depth/stencil buffer only.
+ */
+void GLAPIENTRY
+_mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
+ GLfloat depth, GLint stencil)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (!ctx->DrawBuffer->Visual.rgbMode) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glClearBufferfi()");
+ return;
+ }
+
+ if (buffer != GL_DEPTH_STENCIL) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfi(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+
+ if (drawbuffer != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfi(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ {
+ /* save current clear values */
+ const GLfloat clearDepthSave = ctx->Depth.Clear;
+ const GLuint clearStencilSave = ctx->Stencil.Clear;
+
+ /* set new clear values */
+ ctx->Depth.Clear = depth;
+ ctx->Stencil.Clear = stencil;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, depth);
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, stencil);
+
+ /* clear buffers */
+ ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
+
+ /* restore */
+ ctx->Depth.Clear = clearDepthSave;
+ ctx->Stencil.Clear = clearStencilSave;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, clearDepthSave);
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, clearStencilSave);
+ }
+}
diff --git a/src/mesa/main/clear.h b/src/mesa/main/clear.h
index 9a54ba1..4c78eed 100644
--- a/src/mesa/main/clear.h
+++ b/src/mesa/main/clear.h
@@ -41,4 +41,17 @@ extern void GLAPIENTRY
_mesa_Clear( GLbitfield mask );
+extern void GLAPIENTRY
+_mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value);
+
+extern void GLAPIENTRY
+_mesa_ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint *value);
+
+extern void GLAPIENTRY
+_mesa_ClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat *value);
+
+extern void GLAPIENTRY
+_mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
+ GLfloat depth, GLint stencil);
+
#endif
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