diff options
Diffstat (limited to 'mesalib/src/mesa/main/scissor.c')
| -rw-r--r-- | mesalib/src/mesa/main/scissor.c | 161 |
1 files changed, 145 insertions, 16 deletions
diff --git a/mesalib/src/mesa/main/scissor.c b/mesalib/src/mesa/main/scissor.c index ac86bd591..14c8e8a6c 100644 --- a/mesalib/src/mesa/main/scissor.c +++ b/mesalib/src/mesa/main/scissor.c @@ -30,11 +30,37 @@ /** + * Set scissor rectangle data directly in ScissorArray + * + * This is an internal function that performs no error checking on the + * supplied data. It also does \b not call \c dd_function_table::Scissor. + * + * \sa _mesa_set_scissor + */ +static void +set_scissor_no_notify(struct gl_context *ctx, unsigned idx, + GLint x, GLint y, GLsizei width, GLsizei height) +{ + if (x == ctx->Scissor.ScissorArray[idx].X && + y == ctx->Scissor.ScissorArray[idx].Y && + width == ctx->Scissor.ScissorArray[idx].Width && + height == ctx->Scissor.ScissorArray[idx].Height) + return; + + FLUSH_VERTICES(ctx, _NEW_SCISSOR); + ctx->Scissor.ScissorArray[idx].X = x; + ctx->Scissor.ScissorArray[idx].Y = y; + ctx->Scissor.ScissorArray[idx].Width = width; + ctx->Scissor.ScissorArray[idx].Height = height; +} + +/** * Called via glScissor */ void GLAPIENTRY _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) { + unsigned i; GET_CURRENT_CONTEXT(ctx); if (MESA_VERBOSE & VERBOSE_API) @@ -45,7 +71,23 @@ _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) return; } - _mesa_set_scissor(ctx, x, y, width, height); + /* The GL_ARB_viewport_array spec says: + * + * "Scissor sets the scissor rectangle for all viewports to the same + * values and is equivalent (assuming no errors are generated) to: + * + * for (uint i = 0; i < MAX_VIEWPORTS; i++) { + * ScissorIndexed(i, left, bottom, width, height); + * }" + * + * Set the scissor rectangle for all of the viewports supported by the + * implementation, but only signal the driver once at the end. + */ + for (i = 0; i < ctx->Const.MaxViewports; i++) + set_scissor_no_notify(ctx, i, x, y, width, height); + + if (ctx->Driver.Scissor) + ctx->Driver.Scissor(ctx); } @@ -63,25 +105,108 @@ _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) * the dd_function_table::Scissor callback. */ void -_mesa_set_scissor(struct gl_context *ctx, +_mesa_set_scissor(struct gl_context *ctx, unsigned idx, GLint x, GLint y, GLsizei width, GLsizei height) { - if (x == ctx->Scissor.X && - y == ctx->Scissor.Y && - width == ctx->Scissor.Width && - height == ctx->Scissor.Height) + set_scissor_no_notify(ctx, idx, x, y, width, height); + + if (ctx->Driver.Scissor) + ctx->Driver.Scissor(ctx); +} + +/** + * Define count scissor boxes starting at index. + * + * \param index index of first scissor records to set + * \param count number of scissor records to set + * \param x, y pointer to array of struct gl_scissor_rects + * + * \sa glScissorArrayv(). + * + * Verifies the parameters and call set_scissor_no_notify to do the work. + */ +void GLAPIENTRY +_mesa_ScissorArrayv(GLuint first, GLsizei count, const GLint *v) +{ + int i; + struct gl_scissor_rect *p = (struct gl_scissor_rect *) v; + GET_CURRENT_CONTEXT(ctx); + + if ((first + count) > ctx->Const.MaxViewports) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glScissorArrayv: first (%d) + count (%d) >= MaxViewports (%d)", + first, count, ctx->Const.MaxViewports); return; + } - FLUSH_VERTICES(ctx, _NEW_SCISSOR); - ctx->Scissor.X = x; - ctx->Scissor.Y = y; - ctx->Scissor.Width = width; - ctx->Scissor.Height = height; + /* Verify width & height */ + for (i = 0; i < count; i++) { + if (p[i].Width < 0 || p[i].Height < 0) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glScissorArrayv: index (%d) width or height < 0 (%d, %d)", + i, p[i].Width, p[i].Height); + } + } + + for (i = 0; i < count; i++) + set_scissor_no_notify(ctx, i + first, + p[i].X, p[i].Y, p[i].Width, p[i].Height); if (ctx->Driver.Scissor) ctx->Driver.Scissor(ctx); } +/** + * Define the scissor box. + * + * \param index index of scissor records to set + * \param x, y coordinates of the scissor box lower-left corner. + * \param width width of the scissor box. + * \param height height of the scissor box. + * + * Verifies the parameters call set_scissor_no_notify to do the work. + */ +static void +ScissorIndexed(GLuint index, GLint left, GLint bottom, + GLsizei width, GLsizei height, const char *function) +{ + GET_CURRENT_CONTEXT(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "%s(%d, %d, %d, %d, %d)\n", + function, index, left, bottom, width, height); + + if (index >= ctx->Const.MaxViewports) { + _mesa_error(ctx, GL_INVALID_VALUE, + "%s: index (%d) >= MaxViewports (%d)", + function, index, ctx->Const.MaxViewports); + return; + } + + if (width < 0 || height < 0) { + _mesa_error(ctx, GL_INVALID_VALUE, + "%s: index (%d) width or height < 0 (%d, %d)", + function, index, width, height); + } + + set_scissor_no_notify(ctx, index, left, bottom, width, height); + + if (ctx->Driver.Scissor) + ctx->Driver.Scissor(ctx); +} + +void GLAPIENTRY +_mesa_ScissorIndexed(GLuint index, GLint left, GLint bottom, + GLsizei width, GLsizei height) +{ + ScissorIndexed(index, left, bottom, width, height, "glScissorIndexd"); +} + +void GLAPIENTRY +_mesa_ScissorIndexedv(GLuint index, const GLint *v) +{ + ScissorIndexed(index, v[0], v[1], v[2], v[3], "glScissorIndexdv"); +} /** * Initialize the context's scissor state. @@ -90,10 +215,14 @@ _mesa_set_scissor(struct gl_context *ctx, void _mesa_init_scissor(struct gl_context *ctx) { + unsigned i; + /* Scissor group */ - ctx->Scissor.Enabled = GL_FALSE; - ctx->Scissor.X = 0; - ctx->Scissor.Y = 0; - ctx->Scissor.Width = 0; - ctx->Scissor.Height = 0; + ctx->Scissor.EnableFlags = 0; + + /* Note: ctx->Const.MaxViewports may not have been set by the driver yet, + * so just initialize all of them. + */ + for (i = 0; i < MAX_VIEWPORTS; i++) + set_scissor_no_notify(ctx, i, 0, 0, 0, 0); } |