#include "enums.h"
#include "fbobject.h"
#include "mtypes.h"
+#include "util/bitscan.h"
#define BAD_MASK ~0u
if (_mesa_is_user_fbo(fb)) {
/* A user-created renderbuffer */
- GLuint i;
- for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
- mask |= (BUFFER_BIT_COLOR0 << i);
- }
+ mask = ((1 << ctx->Const.MaxColorAttachments) - 1) << BUFFER_COLOR0;
}
else {
/* A window system framebuffer */
* return -1 for an invalid buffer.
*/
static gl_buffer_index
-read_buffer_enum_to_index(GLenum buffer)
+read_buffer_enum_to_index(const struct gl_context *ctx, GLenum buffer)
{
switch (buffer) {
case GL_FRONT:
return BUFFER_FRONT_LEFT;
case GL_BACK:
+ if (_mesa_is_gles(ctx)) {
+ /* In draw_buffer_enum_to_bitmask, when GLES contexts draw to
+ * GL_BACK with a single-buffered configuration, we actually end
+ * up drawing to the sole front buffer in our internal
+ * representation. For consistency, we must read from that
+ * front left buffer too.
+ */
+ if (!ctx->DrawBuffer->Visual.doubleBufferMode)
+ return BUFFER_FRONT_LEFT;
+ }
return BUFFER_BACK_LEFT;
case GL_RIGHT:
return BUFFER_FRONT_RIGHT;
}
}
+static bool
+is_legal_es3_readbuffer_enum(GLenum buf)
+{
+ return buf == GL_BACK || buf == GL_NONE ||
+ (buf >= GL_COLOR_ATTACHMENT0 && buf <= GL_COLOR_ATTACHMENT31);
+}
/**
- * Called by glDrawBuffer().
+ * Called by glDrawBuffer() and glNamedFramebufferDrawBuffer().
* Specify which renderbuffer(s) to draw into for the first color output.
* <buffer> can name zero, one, two or four renderbuffers!
* \sa _mesa_DrawBuffers
*
* See the GL_EXT_framebuffer_object spec for more info.
*/
-void
-_mesa_draw_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
- GLenum buffer, const char *caller)
+static void
+draw_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller)
{
GLbitfield destMask;
_mesa_DrawBuffer(GLenum buffer)
{
GET_CURRENT_CONTEXT(ctx);
- _mesa_draw_buffer(ctx, ctx->DrawBuffer, buffer, "glDrawBuffer");
+ draw_buffer(ctx, ctx->DrawBuffer, buffer, "glDrawBuffer");
}
else
fb = ctx->WinSysDrawBuffer;
- _mesa_draw_buffer(ctx, fb, buf, "glNamedFramebufferDrawBuffer");
+ draw_buffer(ctx, fb, buf, "glNamedFramebufferDrawBuffer");
}
/**
- * Called by glDrawBuffersARB; specifies the destination color renderbuffers
- * for N fragment program color outputs.
+ * Called by glDrawBuffersARB() and glNamedFramebufferDrawBuffers() to specify
+ * the destination color renderbuffers for N fragment program color outputs.
* \sa _mesa_DrawBuffer
* \param n number of outputs
* \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
* names cannot specify more than one buffer. For example,
* GL_FRONT_AND_BACK is illegal.
*/
-void
-_mesa_draw_buffers(struct gl_context *ctx, struct gl_framebuffer *fb,
- GLsizei n, const GLenum *buffers, const char *caller)
+static void
+draw_buffers(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLsizei n, const GLenum *buffers, const char *caller)
{
GLuint output;
GLbitfield usedBufferMask, supportedMask;
_mesa_DrawBuffers(GLsizei n, const GLenum *buffers)
{
GET_CURRENT_CONTEXT(ctx);
- _mesa_draw_buffers(ctx, ctx->DrawBuffer, n, buffers, "glDrawBuffers");
+ draw_buffers(ctx, ctx->DrawBuffer, n, buffers, "glDrawBuffers");
}
else
fb = ctx->WinSysDrawBuffer;
- _mesa_draw_buffers(ctx, fb, n, bufs, "glNamedFramebufferDrawBuffers");
+ draw_buffers(ctx, fb, n, bufs, "glNamedFramebufferDrawBuffers");
}
/**
- * Helper function to set the GL_DRAW_BUFFER state in the context and
- * current FBO. Called via glDrawBuffer(), glDrawBuffersARB()
+ * Helper function to set the GL_DRAW_BUFFER state for the given context and
+ * FBO. Called via glDrawBuffer(), glDrawBuffersARB()
*
* All error checking will have been done prior to calling this function
* so nothing should go wrong at this point.
if (n > 0 && _mesa_bitcount(destMask[0]) > 1) {
GLuint count = 0, destMask0 = destMask[0];
while (destMask0) {
- GLint bufIndex = ffs(destMask0) - 1;
+ const int bufIndex = u_bit_scan(&destMask0);
if (fb->_ColorDrawBufferIndexes[count] != bufIndex) {
updated_drawbuffers(ctx, fb);
fb->_ColorDrawBufferIndexes[count] = bufIndex;
}
count++;
- destMask0 &= ~(1 << bufIndex);
}
fb->ColorDrawBuffer[0] = buffers[0];
fb->_NumColorDrawBuffers = count;
/**
* Like \sa _mesa_drawbuffers(), this is a helper function for setting
- * GL_READ_BUFFER state in the context and current FBO.
+ * GL_READ_BUFFER state for the given context and FBO.
+ * Note that all error checking should have been done before calling
+ * this function.
* \param ctx the rendering context
+ * \param fb the framebuffer object to update
* \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc.
* \param bufferIndex the numerical index corresponding to 'buffer'
*/
/**
- * Called by glReadBuffer to set the source renderbuffer for reading pixels.
+ * Called by glReadBuffer and glNamedFramebufferReadBuffer to set the source
+ * renderbuffer for reading pixels.
* \param mode color buffer such as GL_FRONT, GL_BACK, etc.
*/
-void
-_mesa_read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
- GLenum buffer, const char *caller)
+static void
+read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller)
{
GLbitfield supportedMask;
gl_buffer_index srcBuffer;
}
else {
/* general case / window-system framebuffer */
- srcBuffer = read_buffer_enum_to_index(buffer);
+ if (_mesa_is_gles3(ctx) && !is_legal_es3_readbuffer_enum(buffer))
+ srcBuffer = -1;
+ else
+ srcBuffer = read_buffer_enum_to_index(ctx, buffer);
+
if (srcBuffer == -1) {
_mesa_error(ctx, GL_INVALID_ENUM,
"%s(invalid buffer %s)", caller,
_mesa_ReadBuffer(GLenum buffer)
{
GET_CURRENT_CONTEXT(ctx);
- _mesa_read_buffer(ctx, ctx->ReadBuffer, buffer, "glReadBuffer");
+ read_buffer(ctx, ctx->ReadBuffer, buffer, "glReadBuffer");
}
else
fb = ctx->WinSysReadBuffer;
- _mesa_read_buffer(ctx, fb, src, "glNamedFramebufferReadBuffer");
+ read_buffer(ctx, fb, src, "glNamedFramebufferReadBuffer");
}
projects / mesa.git / blobdiff