diff options
Diffstat (limited to 'mesalib/src/mesa/main/mtypes.h')
| -rw-r--r-- | mesalib/src/mesa/main/mtypes.h | 101 |
1 files changed, 91 insertions, 10 deletions
diff --git a/mesalib/src/mesa/main/mtypes.h b/mesalib/src/mesa/main/mtypes.h index 4fb30ffba..553a21667 100644 --- a/mesalib/src/mesa/main/mtypes.h +++ b/mesalib/src/mesa/main/mtypes.h @@ -1526,7 +1526,6 @@ struct gl_client_array GLuint _ElementSize; /**< size of each element in bytes */ struct gl_buffer_object *BufferObj;/**< GL_ARB_vertex_buffer_object */ - GLuint _MaxElement; /**< max element index into array buffer + 1 */ }; @@ -1629,12 +1628,6 @@ struct gl_vertex_array_object /** Mask of VERT_BIT_* values indicating changed/dirty arrays */ GLbitfield64 NewArrays; - /** - * Min of all enabled arrays' _MaxElement. When arrays reside inside VBOs - * we can determine the max legal (in bounds) glDrawElements array index. - */ - GLuint _MaxElement; - /** The index buffer (also known as the element array buffer in OpenGL). */ struct gl_buffer_object *IndexBufferObj; }; @@ -2055,8 +2048,90 @@ typedef enum * \name Vertex shader system values */ /*@{*/ + /** + * OpenGL-style vertex ID. + * + * Section 2.11.7 (Shader Execution), subsection Shader Inputs, of the + * OpenGL 3.3 core profile spec says: + * + * "gl_VertexID holds the integer index i implicitly passed by + * DrawArrays or one of the other drawing commands defined in section + * 2.8.3." + * + * Section 2.8.3 (Drawing Commands) of the same spec says: + * + * "The commands....are equivalent to the commands with the same base + * name (without the BaseVertex suffix), except that the ith element + * transferred by the corresponding draw call will be taken from + * element indices[i] + basevertex of each enabled array." + * + * Additionally, the overview in the GL_ARB_shader_draw_parameters spec + * says: + * + * "In unextended GL, vertex shaders have inputs named gl_VertexID and + * gl_InstanceID, which contain, respectively the index of the vertex + * and instance. The value of gl_VertexID is the implicitly passed + * index of the vertex being processed, which includes the value of + * baseVertex, for those commands that accept it." + * + * gl_VertexID gets basevertex added in. This differs from DirectX where + * SV_VertexID does \b not get basevertex added in. + * + * \note + * If all system values are available, \c SYSTEM_VALUE_VERTEX_ID will be + * equal to \c SYSTEM_VALUE_VERTEX_ID_ZERO_BASE plus + * \c SYSTEM_VALUE_BASE_VERTEX. + * + * \sa SYSTEM_VALUE_VERTEX_ID_ZERO_BASE, SYSTEM_VALUE_BASE_VERTEX + */ SYSTEM_VALUE_VERTEX_ID, + + /** + * Instanced ID as supplied to gl_InstanceID + * + * Values assigned to gl_InstanceID always begin with zero, regardless of + * the value of baseinstance. + * + * Section 11.1.3.9 (Shader Inputs) of the OpenGL 4.4 core profile spec + * says: + * + * "gl_InstanceID holds the integer instance number of the current + * primitive in an instanced draw call (see section 10.5)." + * + * Through a big chain of pseudocode, section 10.5 describes that + * baseinstance is not counted by gl_InstanceID. In that section, notice + * + * "If an enabled vertex attribute array is instanced (it has a + * non-zero divisor as specified by VertexAttribDivisor), the element + * index that is transferred to the GL, for all vertices, is given by + * + * floor(instance/divisor) + baseinstance + * + * If an array corresponding to an attribute required by a vertex + * shader is not enabled, then the corresponding element is taken from + * the current attribute state (see section 10.2)." + * + * Note that baseinstance is \b not included in the value of instance. + */ SYSTEM_VALUE_INSTANCE_ID, + + /** + * DirectX-style vertex ID. + * + * Unlike \c SYSTEM_VALUE_VERTEX_ID, this system value does \b not include + * the value of basevertex. + * + * \sa SYSTEM_VALUE_VERTEX_ID, SYSTEM_VALUE_BASE_VERTEX + */ + SYSTEM_VALUE_VERTEX_ID_ZERO_BASE, + + /** + * Value of \c basevertex passed to \c glDrawElementsBaseVertex and similar + * functions. + * + * \sa SYSTEM_VALUE_VERTEX_ID, SYSTEM_VALUE_VERTEX_ID_ZERO_BASE + */ + SYSTEM_VALUE_BASE_VERTEX, /*@}*/ /** @@ -3350,9 +3425,6 @@ struct gl_constants GLuint PrimitivesWritten; } QueryCounterBits; - /** vertex array / buffer object bounds checking */ - GLboolean CheckArrayBounds; - GLuint MaxDrawBuffers; /**< GL_ARB_draw_buffers */ GLuint MaxColorAttachments; /**< GL_EXT_framebuffer_object */ @@ -3406,6 +3478,15 @@ struct gl_constants GLboolean NativeIntegers; /** + * Does VertexID count from zero or from base vertex? + * + * \note + * If desktop GLSL 1.30 or GLSL ES 3.00 are not supported, this field is + * ignored and need not be set. + */ + bool VertexID_is_zero_based; + + /** * If the driver supports real 32-bit integers, what integer value should be * used for boolean true in uniform uploads? (Usually 1 or ~0.) */ |